function cpos(s, n) = (n == -1) ? (0) : ( cpos(s,n-1) + (s[n]==".") ? 2 : 4 ); // run through expected results from cpos ("--.-", 3): s = "--.-"; echo (s[0]=="."? 2 : 4); // Outputs "ECHO: 4" - CORRECT echo (s[1]=="."? 2 : 4); // Outputs "ECHO: 4" - CORRECT echo (s[2]=="."? 2 : 4); // Outputs "ECHO: 2" - CORRECT echo (s[3]=="."? 2 : 4); // Outputs "ECHO: 4" - CORRECT echo ( 0 // n = -1 + s[0]=="."?2:4 // n = 0 so should be 4 + s[1]=="."?2:4 // n = 1 so should be 4 + s[2]=="."?2:4 // n = 2 so should be 2 + s[3]=="."?2:4 // n = 3 so should be 4 ); // Outputs "ECHO: 4" - should be 0 + 4 + 4 + 2 + 4 = 14 -- View this message in context: http://forum.openscad.org/Incrementing-a-variable-doesn-t-work-as-expected-tp12271p12281.html Sent from the OpenSCAD mailing list archive at Nabble.com.

BTW you may want to check out assign() [depricated] <https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#Assign_Statement> and this. <https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions> ----- Unless specifically shown otherwise above, my contribution is in the Public Domain; To the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. This work is published globally via the internet. :) Inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ -- View this message in context: http://forum.openscad.org/Incrementing-a-variable-doesn-t-work-as-expected-tp12271p12282.html Sent from the OpenSCAD mailing list archive at Nabble.com.

Your last example works if you add some brackets echo ( 0 // n = -1 + (s[0]=="."?2:4) // n = 0 so should be 4 + (s[1]=="."?2:4) // n = 1 so should be 4 + (s[2]=="."?2:4) // n = 2 so should be 2 + (s[3]=="."?2:4) // n = 3 so should be 4 ); // Outputs "ECHO: 14" On 1 April 2015 at 10:57, MichaelAtOz <oz.at.michael@gmail.com> wrote: > BTW you may want to check out assign() [depricated] > < > https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#Assign_Statement > > > and this. > <https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions> > > > > ----- > Unless specifically shown otherwise above, my contribution is in the > Public Domain; To the extent possible under law, I have waived all > copyright and related or neighbouring rights to this work. This work is > published globally via the internet. :) Inclusion of works of previous > authors is not included in the above. > > The TPP is no simple "trade agreement." Fight it! > http://www.ourfairdeal.org/ > -- > View this message in context: > http://forum.openscad.org/Incrementing-a-variable-doesn-t-work-as-expected-tp12271p12282.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >

And there's the answer - brackets :) function cpos(s, n) = (n == 0) ? (0) : ( cpos(s,n-1) + ((s[n-1]==".") ? 2 : 4 )); Now works as expected. Thanks guys!!! N. -- View this message in context: http://forum.openscad.org/Incrementing-a-variable-doesn-t-work-as-expected-tp12271p12284.html Sent from the OpenSCAD mailing list archive at Nabble.com.

You need the same brackets in cpos() otherwise it does the add before the ?. You also have lots of brackets where you don't need them. function cpos(s, n) = n == -1 ? 0 : cpos(s,n-1) + (s[n]=="." ? 2 : 4 ); On 1 April 2015 at 11:07, nop head <nop.head@gmail.com> wrote: > Your last example works if you add some brackets > > echo ( 0 // n = -1 > + (s[0]=="."?2:4) // n = 0 so should be 4 > + (s[1]=="."?2:4) // n = 1 so should be 4 > + (s[2]=="."?2:4) // n = 2 so should be 2 > + (s[3]=="."?2:4) // n = 3 so should be 4 > ); // Outputs "ECHO: 14" > > > On 1 April 2015 at 10:57, MichaelAtOz <oz.at.michael@gmail.com> wrote: > >> BTW you may want to check out assign() [depricated] >> < >> https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Conditional_and_Iterator_Functions#Assign_Statement >> > >> and this. >> <https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/List_Comprehensions> >> >> >> >> ----- >> Unless specifically shown otherwise above, my contribution is in the >> Public Domain; To the extent possible under law, I have waived all >> copyright and related or neighbouring rights to this work. This work is >> published globally via the internet. :) Inclusion of works of previous >> authors is not included in the above. >> >> The TPP is no simple "trade agreement." Fight it! >> http://www.ourfairdeal.org/ >> -- >> View this message in context: >> http://forum.openscad.org/Incrementing-a-variable-doesn-t-work-as-expected-tp12271p12282.html >> Sent from the OpenSCAD mailing list archive at Nabble.com. >> >> _______________________________________________ >> OpenSCAD mailing list >> Discuss@lists.openscad.org >> http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org >> > >

I'm usually an avid bracketer for readability and avoidance of doubt. This one beat me Thanks again. -- View this message in context: http://forum.openscad.org/Incrementing-a-variable-doesn-t-work-as-expected-tp12271p12286.html Sent from the OpenSCAD mailing list archive at Nabble.com.