[Getdp] Can I concatenate functions in GetDP?

[Christophe Geuzaine]

> On 26 Nov 2016, at 16:25, junniers romero <junniersromero at gmail.com> wrote:
> 
> Hollo Mr. Geuzaine,
> 
> I'm very pleased and thankful for the last material you sent me. It's come quite handy. Now, I'm trying to implement a VSD's voltage source in the machine's model scripts. Since I need the Fourier approximation with many terms, I was wandering whether it's possible to build a global function by concatenating the same function N times via a For loop? For example:
> 
> For n In {1:1000}
>      Wave_VSD [] += Wave_VSD + (1/n)*(Cos(n)Sin(n*2*Pi*$Time)) ;
> EndFor 
>            ; where (n) changes according to the For loop increment.
> 

You can, but it's a bit tricky: the idea is that you can create and append to a string, and then parse the string

str = "Wave_VSD[] = 42";
For n In {1:1000}
  str = StrCat[str, Sprintf["+(1/%g)*(Cos[%g]*Sin[%g*2*Pi*$Time])", n, n, n]];
EndFor
str = StrCat[str, ";"];
Parse[str];

You'll need a fairly recent version of GetDP for this (the "Parse" function is rather new).

CC:ing the list, as this might be useful to other people, too.

Christophe


>    Thank you very much again, I'd appreciate your help deeply. 
> 
> Best Regards,
> 
> Junniers Romero
> 
> Venezuela - South America
> Simón Bolívar University
> Undergrad-Student

-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

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