I've been using OpenSCAD for about two years and I just realized that I don't know how to something simple like increment a variable or pass a value from one part of my code to another. Case in point. I have a vector of vectors: x = [[3,5],[1,6],[6,1],[8,4]] I'd like to count the number of times that the first element of each sub vector exceeds 2. I think I can iterate through x with a for loop and ask whether x[i][0] > 1, but I don't know what to do with the result of that comparison. k=0 then k=k+1 isn't supported in the language. And even if it was, k is undefined outside of the loop. A function may be helpful, but it looks like a function is just a line of code that has been set aside for modularity. Search can iterate across a vector but any comparison has to be equality, nothing as fancy as "greater than". Ken

A recursive function can do what you want. function count_more_than(v, n = 2, i = 0, count = 0) = i >= len(v) ? count : count_more_than(v, n, i + 1, count = v[i][0] > n ? count + 1 : count); x = [[3,5],[1,6],[6,1],[8,4]]; echo(count_more_than(x)); On Fri, 27 Nov 2020 at 22:54, <ken@volksswitch.org> wrote: > I’ve been using OpenSCAD for about two years and I just realized that I > don’t know how to something simple like increment a variable or pass a > value from one part of my code to another. > > > > Case in point. I have a vector of vectors: x = [[3,5],[1,6],[6,1],[8,4]] > I’d like to count the number of times that the first element of each sub > vector exceeds 2. > > > > I think I can iterate through x with a for loop and ask whether x[i][0] > > 1, but I don’t know what to do with the result of that comparison. k=0 then > k=k+1 isn’t supported in the language. And even if it was, k is undefined > outside of the loop. > > > > A function may be helpful, but it looks like a function is just a line of > code that has been set aside for modularity. Search can iterate across a > vector but any comparison has to be equality, nothing as fancy as “greater > than”. > > > > Ken > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

Don’t even need to go recursive for this. len([for (x=v) if(x[0]>n) 1]) > On Nov 27, 2020, at 3:05 PM, nop head <nop.head@gmail.com> wrote: > >  > A recursive function can do what you want. > > function count_more_than(v, n = 2, i = 0, count = 0) = i >= len(v) ? count : count_more_than(v, n, i + 1, count = v[i][0] > n ? count + 1 : count); > > x = [[3,5],[1,6],[6,1],[8,4]]; > > echo(count_more_than(x)); > > > > On Fri, 27 Nov 2020 at 22:54, <ken@volksswitch.org> wrote: >> I’ve been using OpenSCAD for about two years and I just realized that I don’t know how to something simple like increment a variable or pass a value from one part of my code to another. >> >> >> >> Case in point. I have a vector of vectors: x = [[3,5],[1,6],[6,1],[8,4]] I’d like to count the number of times that the first element of each sub vector exceeds 2. >> >> >> >> I think I can iterate through x with a for loop and ask whether x[i][0] > 1, but I don’t know what to do with the result of that comparison. k=0 then k=k+1 isn’t supported in the language. And even if it was, k is undefined outside of the loop. >> >> >> >> A function may be helpful, but it looks like a function is just a line of code that has been set aside for modularity. Search can iterate across a vector but any comparison has to be equality, nothing as fancy as “greater than”. >> >> >> >> Ken >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

 I’ve been using OpenSCAD for about two years and I just realized
 that I don’t know how to something simple like increment a
 variable or pass a value from one part of my code to another.

 Case in point.  I have a vector of vectors: x =
 [[3,5],[1,6],[6,1],[8,4]]  I’d like to count the number of times
 that the first element of each sub vector exceeds 2.

 I think I can iterate through x with a for loop and ask whether
 x[i][0] > 1, but I don’t know what to do with the result of that
 comparison. k=0 then k=k+1 isn’t supported in the language.  And
 even if it was, k is undefined outside of the loop.

 A function may be helpful, but it looks like a function is just a
 line of code that has been set aside for modularity.  Search can
 iterate across a vector but any comparison has to be equality,
 nothing as fancy as “greater than”.

 Ken

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 Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org>
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 <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org>

Revar, you must be a C programmer! On 11/27/20 5:39 PM, Revar Desmera wrote: > Don’t even need to go recursive for this. > len([for (x=v) if(x[0]>n) 1]) > >> On Nov 27, 2020, at 3:05 PM, nop head <nop.head@gmail.com> wrote: >> >>  >> A recursive function  can do what you want. >> >> function count_more_than(v, n = 2, i = 0, count = 0) = i >= len(v) ? >> count : count_more_than(v, n, i + 1, count = v[i][0] > n ? count + 1 >> : count); >> >> x = [[3,5],[1,6],[6,1],[8,4]]; >> >> echo(count_more_than(x)); >> >> >> >> On Fri, 27 Nov 2020 at 22:54, <ken@volksswitch.org >> <mailto:ken@volksswitch.org>> wrote: >> >> I’ve been using OpenSCAD for about two years and I just realized >> that I don’t know how to something simple like increment a >> variable or pass a value from one part of my code to another. >> >> Case in point.  I have a vector of vectors: x = >> [[3,5],[1,6],[6,1],[8,4]]  I’d like to count the number of times >> that the first element of each sub vector exceeds 2. >> >> I think I can iterate through x with a for loop and ask whether >> x[i][0] > 1, but I don’t know what to do with the result of that >> comparison. k=0 then k=k+1 isn’t supported in the language.  And >> even if it was, k is undefined outside of the loop. >> >> A function may be helpful, but it looks like a function is just a >> line of code that has been set aside for modularity.  Search can >> iterate across a vector but any comparison has to be equality, >> nothing as fancy as “greater than”. >> >> Ken >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org <mailto:Discuss@lists.openscad.org> >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> <http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Yes, C and twenty or thirty other languages. Plus a few domain specific languages I wrote. -Revar > On Nov 27, 2020, at 5:01 PM, David <ainut@hiwaay.net> wrote: > >  > Revar, you must be a C programmer! > > > > On 11/27/20 5:39 PM, Revar Desmera wrote: >> Don’t even need to go recursive for this. >> len([for (x=v) if(x[0]>n) 1]) >> >>> On Nov 27, 2020, at 3:05 PM, nop head <nop.head@gmail.com> wrote: >>> >>>  >>> A recursive function can do what you want. >>> >>> function count_more_than(v, n = 2, i = 0, count = 0) = i >= len(v) ? count : count_more_than(v, n, i + 1, count = v[i][0] > n ? count + 1 : count); >>> >>> x = [[3,5],[1,6],[6,1],[8,4]]; >>> >>> echo(count_more_than(x)); >>> >>> >>> >>> On Fri, 27 Nov 2020 at 22:54, <ken@volksswitch.org> wrote: >>>> I’ve been using OpenSCAD for about two years and I just realized that I don’t know how to something simple like increment a variable or pass a value from one part of my code to another. >>>> >>>> >>>> >>>> Case in point. I have a vector of vectors: x = [[3,5],[1,6],[6,1],[8,4]] I’d like to count the number of times that the first element of each sub vector exceeds 2. >>>> >>>> >>>> >>>> I think I can iterate through x with a for loop and ask whether x[i][0] > 1, but I don’t know what to do with the result of that comparison. k=0 then k=k+1 isn’t supported in the language. And even if it was, k is undefined outside of the loop. >>>> >>>> >>>> >>>> A function may be helpful, but it looks like a function is just a line of code that has been set aside for modularity. Search can iterate across a vector but any comparison has to be equality, nothing as fancy as “greater than”. >>>> >>>> >>>> >>>> Ken >>>> >>>> _______________________________________________ >>>> OpenSCAD mailing list >>>> Discuss@lists.openscad.org >>>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >>> _______________________________________________ >>> OpenSCAD mailing list >>> Discuss@lists.openscad.org >>> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Trying to make a mount for a 3D printer sensor.  Constructing all the basic stuff from large basic blocks. What's wrong with there I am?  The subtraction is one doing what I would like it to do.  Something having to do with the faces is my guess but actually, I'm clueless.  :( The last construction I thought would be a cutaway, leaving the vertical arm (I think) of the BL Touch mount for a Creality CR-10 S5 printer.  I could include the STL if the non-parameterized version of need be if/when I can find one, probably on thingiverse. This is from scratch with nothing streamlined and no efficiency attempts in the code yet.  Just straight hunt-and-peck so far. Thanks, David

Found something very similar to what I'm trying to do.  File attached this time.  :) David On 12/4/20 11:52 PM, David wrote: > Trying to make a mount for a 3D printer sensor.  Constructing all the > basic stuff from large basic blocks. > > What's wrong with there I am?  The subtraction is one doing what I > would like it to do.  Something having to do with the faces is my > guess but actually, I'm clueless.  :( > > The last construction I thought would be a cutaway, leaving the > vertical arm (I think) of the BL Touch mount for a Creality CR-10 S5 > printer.  I could include the STL if the non-parameterized version of > need be if/when I can find one, probably on thingiverse. > > This is from scratch with nothing streamlined and no efficiency > attempts in the code yet.  Just straight hunt-and-peck so far. > > Thanks, > > David > > > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

Hard to help without seeing your code. On 4 Dec 2020 at 23:52, David wrote: > Trying to make a mount for a 3D printer sensor.  Constructing all the > basic stuff from large basic blocks. > > What's wrong with there I am?  The subtraction is one doing what I would > like it to do.  Something having to do with the faces is my guess but > actually, I'm clueless.  :( > > The last construction I thought would be a cutaway, leaving the vertical > arm (I think) of the BL Touch mount for a Creality CR-10 S5 printer.  I > could include the STL if the non-parameterized version of need be > if/when I can find one, probably on thingiverse. > > This is from scratch with nothing streamlined and no efficiency attempts > in the code yet.  Just straight hunt-and-peck so far.

Thought I had.  Sorry.  Source is a tad overdone.  <sigh> F6 shows it sorta correctly now.  Still some slots and mount hole for the sensor to "punch out."  That vertical part did not display correctly until just today. // Attempt at a BL Touch (BLT) mounting bracket that fits my CR-10 S5. // Hope to do it all in variables.  :) mbd = 4;    // mounting bolt diameters bltbd = 3;   // mounting blt diameters mbt = 4;    // mounting base thickness armt = 6;   // arm thickness arml = 30;  // total arm length armoffseth = 21.76;   // from bottom of bracket.  too low! mountfw = 34.67;     // mount full width armoffsetl = 18;       // arm offset left mountfh = 37;      // mount full height mounttbhc = 4.19;     // mount top bolt hole center, from right mounttbhbr = 4.4;    // mount top bolt hole center, from bottom mountbbhcr = 22;    // mount bottom bolt hole center, from right mountbbbcb = 32;    // mount bottom bolt hole center, from bottom armbhacr = 23.38;    // arm bolt holes (all) center, from right // all arm bolt holes measured from base, and numbered from base armbh1offset = 8.54;   // arm bolt hole 1 center, from base armbh2offset = 19;     // arm bolt hole 2 center, from base armbh3offset = 27.66;   // arm bolt hole 3 center, from base armtop = 9;             // distanct from top of mount to top of arm // full size base, arm, and total volume difference () {     cube ([mountfh, mountfw, arml]);   //full volume     cube ([28, armoffsetl, arml]);          // subtract lower right block     translate([31.4, mounttbhc, 0])         // set location for bolt hole 1         cylinder(h=mountfh, d=bltbd);           // subtract bolt hole 1     translate([13, 21.85, 0])                   // set location for bolt hole 2         cylinder(h=mountfh, d=bltbd);           // subtract bolt hole 2     translate([0, armoffsetl, mbd])         // set location to remove bottom left chunk        cube([22, 16.7, arml]);                  // subtract that chunk    translate([mountfh - armtop, 0, mbd])    // set location to remove top chunk       // cube([mountfh - armtop, mountfw, mountfh]);      // remove top chunk         cube([mountfh - armtop, mountfw, mountfh]); }     //    translate([28.25, mountfw, mbd]);             // set location to remove top chunk     //    cube([9, mountfw, mountfh]); //translate ([40, 40, 0]) //    cylinder(h=40, d=15); On 12/5/20 12:10 AM, lar3ry@sasktel.net wrote: > Hard to help without seeing your code. > > On 4 Dec 2020 at 23:52, David wrote: > >> Trying to make a mount for a 3D printer sensor.  Constructing all the >> basic stuff from large basic blocks. >> >> What's wrong with there I am?  The subtraction is one doing what I would >> like it to do.  Something having to do with the faces is my guess but >> actually, I'm clueless.  :( >> >> The last construction I thought would be a cutaway, leaving the vertical >> arm (I think) of the BL Touch mount for a Creality CR-10 S5 printer.  I >> could include the STL if the non-parameterized version of need be >> if/when I can find one, probably on thingiverse. >> >> This is from scratch with nothing streamlined and no efficiency attempts >> in the code yet.  Just straight hunt-and-peck so far. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

translate([31,4,-.001])

Well, it's definitely not the way I would go about it, so here's what I would do. You'll have to play with the values, and you are certainly welcome to put them into variables. Note the pound sign (#). It will help you see where the line puts the object. difference() { union() { translate([0,18,0]) cube([37,16.67,4]); translate([22,18,0]) cube([6,16.67,30]); translate([28,0,0]) cube([9,19,4]); } translate([13,22,-.001]) # cylinder(h=6,d=3); translate([31,4,-.001]) # cylinder(h=6,d=3); } -- Sent from: http://forum.openscad.org/