Re: [Help-glpk] Calculate model parameter in a for loop in GMPL

[glpk xypron]

Hello Osman,

GMPL is a functional programming language, see
http://en.wikipedia.org/wiki/Functional_programming

Hence parameters are not calculated in loops.

Please, have a look at the manual doc/gmpl.pdf and the 
examples directory provided with GLPK. Both are available in the
source distribution available at:
ftp://ftp.gnu.org/gnu/glpk/glpk-4.45.tar.gz

>  forall{d in D}: s[g[d]] = s[g[d]]+1;
This statement simply created 20 constraints which require
0 == 1.

Best regards

Xypron


-------- Original-Nachricht --------
> Datum: Sat, 04 Jun 2011 15:55:21 -0400
> Betreff: [Help-glpk] Calculate model parameter in a for loop in GMPL

> Hi All,
> 
> How can I calculate a model parameter in a for loop in GMPL? I tried the
> code below but id did not work.
> 
> set T := 1..10;
> set D := 1..20;
> 
> param s{T} := 0;
> param g{D} := trunc(Uniform(1, 11));
> 
> # compute the size
>  forall{d in D}: s[g[d]] = s[g[d]]+1;
> 
> 
> After the for loop the value of the s[] parameter is still zero for all
> indices.
> 
> 
> Osman Y. Ozaltin
> PhD Candidate
> 1048 Benedum Hall
> Department of Industrial Engineering
> University of Pittsburgh
> Pittsburgh PA 15261
> URL. www.pitt.edu/~oyo1
> E-mail. address@hidden
> Phone. 724-234-8490
> 
> 
> _______________________________________________
> Help-glpk mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/help-glpk

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