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Creating arrays

JW
Joe Weinpert
Sat, May 7, 2022 4:28 PM

Having a problem understanding the "for" function.  Heck, I'm having a
problem understanding programs where all the variables are calculated at
compile time and not runtime.

I have an array of 11 *svg *strings named "svgArray" indexed as 0-10.
This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l
4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder
library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747,
9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242],
[60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971,
14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857],
[67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray"
to match each one in the "svgArray".  This means I have to loop through
the "svgArray", convert the current one to a point array using the
svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the
rest of the scad program?

Having a problem understanding the "*for*" function. Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime. I have an array of 11 *svg *strings named "*svgArray"* indexed as 0-10. This one is from index 4: ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] svg strings can be converted to a *point array* using the *pathbuilder* library function svgPoints(). The above string is converted into this: [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] But ... I would like to create an indexed array of the points named "*pathArray*" to match each one in the "*svgArray*". This means I have to loop through the "*svgArray*", convert the current one to a point array using the *svgPoints*() function then append it to the "*pathArray*" being generated. How can I do that so I can use the array of point arrays throughout the rest of the scad program?
HL
Hans L
Sat, May 7, 2022 4:41 PM

You would do something like this, if I'm understanding your problem correctly:
pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com wrote:

Having a problem understanding the "for" function.  Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.  This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray".  This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the rest of the scad program?


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You would do something like this, if I'm understanding your problem correctly: pathArray = [for(element = svgArray) svgPoints(element)]; On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> wrote: > > Having a problem understanding the "for" function. Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime. > > I have an array of 11 svg strings named "svgArray" indexed as 0-10. This one is from index 4: > > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] > > svg strings can be converted to a point array using the pathbuilder library function svgPoints(). The above string is converted into this: > > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] > > But ... > > I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray". This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated. > > How can I do that so I can use the array of point arrays throughout the rest of the scad program? > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org
JW
Joe Weinpert
Sat, May 7, 2022 5:07 PM

Seems to be working.  Thanks!  What is the purpose of the brackets in
openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem
correctly:
pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com
wrote:

Having a problem understanding the "for" function.  Heck, I'm having a

problem understanding programs where all the variables are calculated at
compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.

This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l

4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder

library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747,

9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242],
[60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971,
14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857],
[67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray"

to match each one in the "svgArray".  This means I have to loop through the
"svgArray", convert the current one to a point array using the svgPoints()
function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the

rest of the scad program?


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Seems to be working. Thanks! What is the purpose of the brackets in openSCAD? On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: > You would do something like this, if I'm understanding your problem > correctly: > pathArray = [for(element = svgArray) svgPoints(element)]; > > On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> > wrote: > > > > Having a problem understanding the "for" function. Heck, I'm having a > problem understanding programs where all the variables are calculated at > compile time and not runtime. > > > > I have an array of 11 svg strings named "svgArray" indexed as 0-10. > This one is from index 4: > > > > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l > 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] > > > > svg strings can be converted to a point array using the pathbuilder > library function svgPoints(). The above string is converted into this: > > > > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, > 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], > [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, > 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], > [67.1286, 6.89428], [64.5886, 6.89428]] > > > > But ... > > > > I would like to create an indexed array of the points named "pathArray" > to match each one in the "svgArray". This means I have to loop through the > "svgArray", convert the current one to a point array using the svgPoints() > function then append it to the "pathArray" being generated. > > > > How can I do that so I can use the array of point arrays throughout the > rest of the scad program? > > > > > > _______________________________________________ > > OpenSCAD mailing list > > To unsubscribe send an email to discuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >
AM
Adrian Mariano
Sat, May 7, 2022 5:18 PM

The brackets make the item a list, just like in the example [1,2,3].
Without the brackets it's just like a bunch of numbers, like writing
1,2,3.  It's the same with for.  You can also write [1,2,3,for(.....),
5,6,7] if you want some additional items in your list.  Or
[1,2,3,for(...),5,6,if (condition) 19].

On Sat, May 7, 2022 at 1:08 PM Joe Weinpert joe.weinpert@gmail.com wrote:

Seems to be working.  Thanks!  What is the purpose of the brackets in openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem correctly:
pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com wrote:

Having a problem understanding the "for" function.  Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.  This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray".  This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the rest of the scad program?


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The brackets make the item a list, just like in the example [1,2,3]. Without the brackets it's just like a bunch of numbers, like writing 1,2,3. It's the same with for. You can also write [1,2,3,for(.....), 5,6,7] if you want some additional items in your list. Or [1,2,3,for(...),5,6,if (condition) 19]. On Sat, May 7, 2022 at 1:08 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: > > Seems to be working. Thanks! What is the purpose of the brackets in openSCAD? > > On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: >> >> You would do something like this, if I'm understanding your problem correctly: >> pathArray = [for(element = svgArray) svgPoints(element)]; >> >> On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> > >> > Having a problem understanding the "for" function. Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime. >> > >> > I have an array of 11 svg strings named "svgArray" indexed as 0-10. This one is from index 4: >> > >> > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] >> > >> > svg strings can be converted to a point array using the pathbuilder library function svgPoints(). The above string is converted into this: >> > >> > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] >> > >> > But ... >> > >> > I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray". This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated. >> > >> > How can I do that so I can use the array of point arrays throughout the rest of the scad program? >> > >> > >> > _______________________________________________ >> > OpenSCAD mailing list >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org
JW
Joe Weinpert
Sat, May 7, 2022 5:25 PM

So, what you are saying is the brackets with for are only used when
making an array (list) of something, correct?

On Sat, May 7, 2022 at 1:18 PM Adrian Mariano avm4@cornell.edu wrote:

The brackets make the item a list, just like in the example [1,2,3].
Without the brackets it's just like a bunch of numbers, like writing
1,2,3.  It's the same with for.  You can also write [1,2,3,for(.....),
5,6,7] if you want some additional items in your list.  Or
[1,2,3,for(...),5,6,if (condition) 19].

On Sat, May 7, 2022 at 1:08 PM Joe Weinpert joe.weinpert@gmail.com
wrote:

Seems to be working.  Thanks!  What is the purpose of the brackets in

openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem

correctly:

 pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com

wrote:

Having a problem understanding the "for" function.  Heck, I'm having

a problem understanding programs where all the variables are calculated at
compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.

This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l

4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder

library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634],

[59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327,
12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659],
[60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915,
8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named

"pathArray" to match each one in the "svgArray".  This means I have to loop
through the "svgArray", convert the current one to a point array using the
svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout

the rest of the scad program?


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So, what you are saying is the brackets with *for* are only used when making an array (list) of something, correct? On Sat, May 7, 2022 at 1:18 PM Adrian Mariano <avm4@cornell.edu> wrote: > The brackets make the item a list, just like in the example [1,2,3]. > Without the brackets it's just like a bunch of numbers, like writing > 1,2,3. It's the same with for. You can also write [1,2,3,for(.....), > 5,6,7] if you want some additional items in your list. Or > [1,2,3,for(...),5,6,if (condition) 19]. > > On Sat, May 7, 2022 at 1:08 PM Joe Weinpert <joe.weinpert@gmail.com> > wrote: > > > > Seems to be working. Thanks! What is the purpose of the brackets in > openSCAD? > > > > On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: > >> > >> You would do something like this, if I'm understanding your problem > correctly: > >> pathArray = [for(element = svgArray) svgPoints(element)]; > >> > >> On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> > wrote: > >> > > >> > Having a problem understanding the "for" function. Heck, I'm having > a problem understanding programs where all the variables are calculated at > compile time and not runtime. > >> > > >> > I have an array of 11 svg strings named "svgArray" indexed as 0-10. > This one is from index 4: > >> > > >> > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l > 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] > >> > > >> > svg strings can be converted to a point array using the pathbuilder > library function svgPoints(). The above string is converted into this: > >> > > >> > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], > [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, > 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], > [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, > 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] > >> > > >> > But ... > >> > > >> > I would like to create an indexed array of the points named > "pathArray" to match each one in the "svgArray". This means I have to loop > through the "svgArray", convert the current one to a point array using the > svgPoints() function then append it to the "pathArray" being generated. > >> > > >> > How can I do that so I can use the array of point arrays throughout > the rest of the scad program? > >> > > >> > > >> > _______________________________________________ > >> > OpenSCAD mailing list > >> > To unsubscribe send an email to discuss-leave@lists.openscad.org > >> _______________________________________________ > >> OpenSCAD mailing list > >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > > > _______________________________________________ > > OpenSCAD mailing list > > To unsubscribe send an email to discuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >
AM
Adrian Mariano
Sat, May 7, 2022 7:26 PM

Yes, the brackets are used only when making a list, though lists of
numbers not in brackets are not valid by themselves, so you can't just
remove the brackets.  The other possible use of for() is as a module,
to make geometry, and it doesn't use brackets.

On Sat, May 7, 2022 at 1:25 PM Joe Weinpert joe.weinpert@gmail.com wrote:

So, what you are saying is the brackets with for are only used when making an array (list) of something, correct?

On Sat, May 7, 2022 at 1:18 PM Adrian Mariano avm4@cornell.edu wrote:

The brackets make the item a list, just like in the example [1,2,3].
Without the brackets it's just like a bunch of numbers, like writing
1,2,3.  It's the same with for.  You can also write [1,2,3,for(.....),
5,6,7] if you want some additional items in your list.  Or
[1,2,3,for(...),5,6,if (condition) 19].

On Sat, May 7, 2022 at 1:08 PM Joe Weinpert joe.weinpert@gmail.com wrote:

Seems to be working.  Thanks!  What is the purpose of the brackets in openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem correctly:
pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com wrote:

Having a problem understanding the "for" function.  Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.  This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray".  This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the rest of the scad program?


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Yes, the brackets are used only when making a list, though lists of numbers not in brackets are not valid by themselves, so you can't just remove the brackets. The other possible use of for() is as a module, to make geometry, and it doesn't use brackets. On Sat, May 7, 2022 at 1:25 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: > > So, what you are saying is the brackets with for are only used when making an array (list) of something, correct? > > > On Sat, May 7, 2022 at 1:18 PM Adrian Mariano <avm4@cornell.edu> wrote: >> >> The brackets make the item a list, just like in the example [1,2,3]. >> Without the brackets it's just like a bunch of numbers, like writing >> 1,2,3. It's the same with for. You can also write [1,2,3,for(.....), >> 5,6,7] if you want some additional items in your list. Or >> [1,2,3,for(...),5,6,if (condition) 19]. >> >> On Sat, May 7, 2022 at 1:08 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> > >> > Seems to be working. Thanks! What is the purpose of the brackets in openSCAD? >> > >> > On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: >> >> >> >> You would do something like this, if I'm understanding your problem correctly: >> >> pathArray = [for(element = svgArray) svgPoints(element)]; >> >> >> >> On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> >> > >> >> > Having a problem understanding the "for" function. Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime. >> >> > >> >> > I have an array of 11 svg strings named "svgArray" indexed as 0-10. This one is from index 4: >> >> > >> >> > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] >> >> > >> >> > svg strings can be converted to a point array using the pathbuilder library function svgPoints(). The above string is converted into this: >> >> > >> >> > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] >> >> > >> >> > But ... >> >> > >> >> > I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray". This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated. >> >> > >> >> > How can I do that so I can use the array of point arrays throughout the rest of the scad program? >> >> > >> >> > >> >> > _______________________________________________ >> >> > OpenSCAD mailing list >> >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> _______________________________________________ >> >> OpenSCAD mailing list >> >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> > >> > _______________________________________________ >> > OpenSCAD mailing list >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org
HL
Hans L
Sat, May 7, 2022 7:26 PM

Using "for" inside brackets is a form of list comprehension:
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions
In that case "for" is part of an expression.

Outside of brackets, "for" is also defined, but in that case it is a
builtin module (it can generate geometry but does not return a
value)
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#For_Loop

Neither are technically "functions", just to be clear (since you
called it such in your original post)

On Sat, May 7, 2022 at 12:25 PM Joe Weinpert joe.weinpert@gmail.com wrote:

So, what you are saying is the brackets with for are only used when making an array (list) of something, correct?

On Sat, May 7, 2022 at 1:18 PM Adrian Mariano avm4@cornell.edu wrote:

The brackets make the item a list, just like in the example [1,2,3].
Without the brackets it's just like a bunch of numbers, like writing
1,2,3.  It's the same with for.  You can also write [1,2,3,for(.....),
5,6,7] if you want some additional items in your list.  Or
[1,2,3,for(...),5,6,if (condition) 19].

On Sat, May 7, 2022 at 1:08 PM Joe Weinpert joe.weinpert@gmail.com wrote:

Seems to be working.  Thanks!  What is the purpose of the brackets in openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem correctly:
pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com wrote:

Having a problem understanding the "for" function.  Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.  This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray".  This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the rest of the scad program?


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Using "for" inside brackets is a form of list comprehension: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions In that case "for" is part of an *expression*. Outside of brackets, "for" is also defined, but in that case it is a builtin *module* (it can generate geometry but does not return a value) https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#For_Loop Neither are technically "functions", just to be clear (since you called it such in your original post) On Sat, May 7, 2022 at 12:25 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: > > So, what you are saying is the brackets with for are only used when making an array (list) of something, correct? > > > On Sat, May 7, 2022 at 1:18 PM Adrian Mariano <avm4@cornell.edu> wrote: >> >> The brackets make the item a list, just like in the example [1,2,3]. >> Without the brackets it's just like a bunch of numbers, like writing >> 1,2,3. It's the same with for. You can also write [1,2,3,for(.....), >> 5,6,7] if you want some additional items in your list. Or >> [1,2,3,for(...),5,6,if (condition) 19]. >> >> On Sat, May 7, 2022 at 1:08 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> > >> > Seems to be working. Thanks! What is the purpose of the brackets in openSCAD? >> > >> > On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: >> >> >> >> You would do something like this, if I'm understanding your problem correctly: >> >> pathArray = [for(element = svgArray) svgPoints(element)]; >> >> >> >> On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> >> > >> >> > Having a problem understanding the "for" function. Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime. >> >> > >> >> > I have an array of 11 svg strings named "svgArray" indexed as 0-10. This one is from index 4: >> >> > >> >> > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] >> >> > >> >> > svg strings can be converted to a point array using the pathbuilder library function svgPoints(). The above string is converted into this: >> >> > >> >> > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] >> >> > >> >> > But ... >> >> > >> >> > I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray". This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated. >> >> > >> >> > How can I do that so I can use the array of point arrays throughout the rest of the scad program? >> >> > >> >> > >> >> > _______________________________________________ >> >> > OpenSCAD mailing list >> >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> _______________________________________________ >> >> OpenSCAD mailing list >> >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> > >> > _______________________________________________ >> > OpenSCAD mailing list >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org
JW
Joe Weinpert
Sun, May 8, 2022 4:33 PM

Yep ... I gotta get used to the fact that in openSCAD the *for *loop is not
a function.

On Sat, May 7, 2022 at 3:27 PM Hans L thehans@gmail.com wrote:

Using "for" inside brackets is a form of list comprehension:
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions
In that case "for" is part of an expression.

Outside of brackets, "for" is also defined, but in that case it is a
builtin module (it can generate geometry but does not return a
value)

https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#For_Loop

Neither are technically "functions", just to be clear (since you
called it such in your original post)

On Sat, May 7, 2022 at 12:25 PM Joe Weinpert joe.weinpert@gmail.com
wrote:

So, what you are saying is the brackets with for are only used when

making an array (list) of something, correct?

On Sat, May 7, 2022 at 1:18 PM Adrian Mariano avm4@cornell.edu wrote:

The brackets make the item a list, just like in the example [1,2,3].
Without the brackets it's just like a bunch of numbers, like writing
1,2,3.  It's the same with for.  You can also write [1,2,3,for(.....),
5,6,7] if you want some additional items in your list.  Or
[1,2,3,for(...),5,6,if (condition) 19].

On Sat, May 7, 2022 at 1:08 PM Joe Weinpert joe.weinpert@gmail.com

wrote:

Seems to be working.  Thanks!  What is the purpose of the brackets

in openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem

correctly:

 pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com

wrote:

Having a problem understanding the "for" function.  Heck, I'm

having a problem understanding programs where all the variables are
calculated at compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as

0-10.  This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l

4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the

pathbuilder library function svgPoints().  The above string is converted
into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634],

[59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327,
12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659],
[60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915,
8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named

"pathArray" to match each one in the "svgArray".  This means I have to loop
through the "svgArray", convert the current one to a point array using the
svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays

throughout the rest of the scad program?


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Yep ... I gotta get used to the fact that in openSCAD the *for *loop is not a function. On Sat, May 7, 2022 at 3:27 PM Hans L <thehans@gmail.com> wrote: > Using "for" inside brackets is a form of list comprehension: > https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions > In that case "for" is part of an *expression*. > > Outside of brackets, "for" is also defined, but in that case it is a > builtin *module* (it can generate geometry but does not return a > value) > > https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#For_Loop > > Neither are technically "functions", just to be clear (since you > called it such in your original post) > > On Sat, May 7, 2022 at 12:25 PM Joe Weinpert <joe.weinpert@gmail.com> > wrote: > > > > So, what you are saying is the brackets with for are only used when > making an array (list) of something, correct? > > > > > > On Sat, May 7, 2022 at 1:18 PM Adrian Mariano <avm4@cornell.edu> wrote: > >> > >> The brackets make the item a list, just like in the example [1,2,3]. > >> Without the brackets it's just like a bunch of numbers, like writing > >> 1,2,3. It's the same with for. You can also write [1,2,3,for(.....), > >> 5,6,7] if you want some additional items in your list. Or > >> [1,2,3,for(...),5,6,if (condition) 19]. > >> > >> On Sat, May 7, 2022 at 1:08 PM Joe Weinpert <joe.weinpert@gmail.com> > wrote: > >> > > >> > Seems to be working. Thanks! What is the purpose of the brackets > in openSCAD? > >> > > >> > On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: > >> >> > >> >> You would do something like this, if I'm understanding your problem > correctly: > >> >> pathArray = [for(element = svgArray) svgPoints(element)]; > >> >> > >> >> On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> > wrote: > >> >> > > >> >> > Having a problem understanding the "for" function. Heck, I'm > having a problem understanding programs where all the variables are > calculated at compile time and not runtime. > >> >> > > >> >> > I have an array of 11 svg strings named "svgArray" indexed as > 0-10. This one is from index 4: > >> >> > > >> >> > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l > 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] > >> >> > > >> >> > svg strings can be converted to a point array using the > pathbuilder library function svgPoints(). The above string is converted > into this: > >> >> > > >> >> > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], > [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, > 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], > [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, > 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] > >> >> > > >> >> > But ... > >> >> > > >> >> > I would like to create an indexed array of the points named > "pathArray" to match each one in the "svgArray". This means I have to loop > through the "svgArray", convert the current one to a point array using the > svgPoints() function then append it to the "pathArray" being generated. > >> >> > > >> >> > How can I do that so I can use the array of point arrays > throughout the rest of the scad program? > >> >> > > >> >> > > >> >> > _______________________________________________ > >> >> > OpenSCAD mailing list > >> >> > To unsubscribe send an email to discuss-leave@lists.openscad.org > >> >> _______________________________________________ > >> >> OpenSCAD mailing list > >> >> To unsubscribe send an email to discuss-leave@lists.openscad.org > >> > > >> > _______________________________________________ > >> > OpenSCAD mailing list > >> > To unsubscribe send an email to discuss-leave@lists.openscad.org > >> _______________________________________________ > >> OpenSCAD mailing list > >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > > > _______________________________________________ > > OpenSCAD mailing list > > To unsubscribe send an email to discuss-leave@lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >
HL
Hans L
Sun, May 8, 2022 8:31 PM

It's not a function in most languages.

On Sun, May 8, 2022 at 11:34 AM Joe Weinpert joe.weinpert@gmail.com wrote:

Yep ... I gotta get used to the fact that in openSCAD the for loop is not a function.

On Sat, May 7, 2022 at 3:27 PM Hans L thehans@gmail.com wrote:

Using "for" inside brackets is a form of list comprehension:
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions
In that case "for" is part of an expression.

Outside of brackets, "for" is also defined, but in that case it is a
builtin module (it can generate geometry but does not return a
value)
https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#For_Loop

Neither are technically "functions", just to be clear (since you
called it such in your original post)

On Sat, May 7, 2022 at 12:25 PM Joe Weinpert joe.weinpert@gmail.com wrote:

So, what you are saying is the brackets with for are only used when making an array (list) of something, correct?

On Sat, May 7, 2022 at 1:18 PM Adrian Mariano avm4@cornell.edu wrote:

The brackets make the item a list, just like in the example [1,2,3].
Without the brackets it's just like a bunch of numbers, like writing
1,2,3.  It's the same with for.  You can also write [1,2,3,for(.....),
5,6,7] if you want some additional items in your list.  Or
[1,2,3,for(...),5,6,if (condition) 19].

On Sat, May 7, 2022 at 1:08 PM Joe Weinpert joe.weinpert@gmail.com wrote:

Seems to be working.  Thanks!  What is the purpose of the brackets in openSCAD?

On Sat, May 7, 2022 at 12:42 PM Hans L thehans@gmail.com wrote:

You would do something like this, if I'm understanding your problem correctly:
pathArray = [for(element = svgArray) svgPoints(element)];

On Sat, May 7, 2022 at 11:28 AM Joe Weinpert joe.weinpert@gmail.com wrote:

Having a problem understanding the "for" function.  Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime.

I have an array of 11 svg strings named "svgArray" indexed as 0-10.  This one is from index 4:

["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"]

svg strings can be converted to a point array using the pathbuilder library function svgPoints().  The above string is converted into this:

[[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]]

But ...

I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray".  This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated.

How can I do that so I can use the array of point arrays throughout the rest of the scad program?


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It's not a function in most languages. On Sun, May 8, 2022 at 11:34 AM Joe Weinpert <joe.weinpert@gmail.com> wrote: > > Yep ... I gotta get used to the fact that in openSCAD the for loop is not a function. > > > On Sat, May 7, 2022 at 3:27 PM Hans L <thehans@gmail.com> wrote: >> >> Using "for" inside brackets is a form of list comprehension: >> https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions >> In that case "for" is part of an *expression*. >> >> Outside of brackets, "for" is also defined, but in that case it is a >> builtin *module* (it can generate geometry but does not return a >> value) >> https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#For_Loop >> >> Neither are technically "functions", just to be clear (since you >> called it such in your original post) >> >> On Sat, May 7, 2022 at 12:25 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> > >> > So, what you are saying is the brackets with for are only used when making an array (list) of something, correct? >> > >> > >> > On Sat, May 7, 2022 at 1:18 PM Adrian Mariano <avm4@cornell.edu> wrote: >> >> >> >> The brackets make the item a list, just like in the example [1,2,3]. >> >> Without the brackets it's just like a bunch of numbers, like writing >> >> 1,2,3. It's the same with for. You can also write [1,2,3,for(.....), >> >> 5,6,7] if you want some additional items in your list. Or >> >> [1,2,3,for(...),5,6,if (condition) 19]. >> >> >> >> On Sat, May 7, 2022 at 1:08 PM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> >> > >> >> > Seems to be working. Thanks! What is the purpose of the brackets in openSCAD? >> >> > >> >> > On Sat, May 7, 2022 at 12:42 PM Hans L <thehans@gmail.com> wrote: >> >> >> >> >> >> You would do something like this, if I'm understanding your problem correctly: >> >> >> pathArray = [for(element = svgArray) svgPoints(element)]; >> >> >> >> >> >> On Sat, May 7, 2022 at 11:28 AM Joe Weinpert <joe.weinpert@gmail.com> wrote: >> >> >> > >> >> >> > Having a problem understanding the "for" function. Heck, I'm having a problem understanding programs where all the variables are calculated at compile time and not runtime. >> >> >> > >> >> >> > I have an array of 11 svg strings named "svgArray" indexed as 0-10. This one is from index 4: >> >> >> > >> >> >> > ["m 57.694281,5.80572 q 2.90284,7.25713 2.90284,8.70856 h 2.54 l 4.35434,-0.36285 v -5.44286 l -0.36288,-1.81429 h -2.54001 z"] >> >> >> > >> >> >> > svg strings can be converted to a point array using the pathbuilder library function svgPoints(). The above string is converted into this: >> >> >> > >> >> >> > [[57.6943, 5.80572], [58.2458, 7.19909], [58.7393, 8.47634], [59.1747, 9.63748], [59.5521, 10.6825], [59.8714, 11.6114], [60.1327, 12.4242], [60.3359, 13.1209], [60.481, 13.7015], [60.5681, 14.1659], [60.5971, 14.5143], [63.1371, 14.5143], [67.4915, 14.1514], [67.4915, 8.70857], [67.1286, 6.89428], [64.5886, 6.89428]] >> >> >> > >> >> >> > But ... >> >> >> > >> >> >> > I would like to create an indexed array of the points named "pathArray" to match each one in the "svgArray". This means I have to loop through the "svgArray", convert the current one to a point array using the svgPoints() function then append it to the "pathArray" being generated. >> >> >> > >> >> >> > How can I do that so I can use the array of point arrays throughout the rest of the scad program? >> >> >> > >> >> >> > >> >> >> > _______________________________________________ >> >> >> > OpenSCAD mailing list >> >> >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> >> _______________________________________________ >> >> >> OpenSCAD mailing list >> >> >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> > >> >> > _______________________________________________ >> >> > OpenSCAD mailing list >> >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> >> _______________________________________________ >> >> OpenSCAD mailing list >> >> To unsubscribe send an email to discuss-leave@lists.openscad.org >> > >> > _______________________________________________ >> > OpenSCAD mailing list >> > To unsubscribe send an email to discuss-leave@lists.openscad.org >> _______________________________________________ >> OpenSCAD mailing list >> To unsubscribe send an email to discuss-leave@lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org