Re: How to express a parameter matrix as a data block in MathProg?

Hi, Yuri!

You can define a data block like this:









*data;param F :=[0,0,1] := 1[0,1,0] := 2[1,0,0] := 3;end;*

If F is a sparse parameter, I suggest you to define it with defaults, so
you don't have to put all the data.

Example:






*param M, default 2;param F{0..M, 0..M, 0..M}, default 0;var x >=0;minimize
cost: sum{m1 in 1..M, m2 in 1..M, m3 in 1..M} x*F[m1, m2, m3];*

About your comment on gmpl documentation:


*"MathProg documentation http://gusek.sourceforge.net/gmpl.pdf
<http://gusek.sourceforge.net/gmpl.pdf> doesn't explain how to do this. It
talks mostly about how to define sets, and seems to focus on 2-dimensional
data."*

*Actually, it explains about slices (the lines I used on F data block),
page 58, and about how to define parameters with slices, page 50.*

Att,

*Thiago H. Neves*



Em ter, 2 de abr de 2019 às 04:03, Yuri <[email protected]> escreveu:

> I need to have a large tabulated parameter matrix, like this:
>
> param m=7;
> param F{1..m, 1..m, 1..m};   # tabulated function
> I would like to define these numeric values in a data block (data; ...;
> end;) in a separate file.
>
> MathProg documentation http://gusek.sourceforge.net/gmpl.pdf doesn't
> explain how to do this. It talks mostly about how to define sets, and
> seems to focus on 2-dimensional data.
>
> How to define values of F[i1,i2,i3]?
>
> My simple attempt:
>
> data;
> F[0,0,0] = 0.0083987;
> F[0,0,1] = 0.01222470;
> F[0,0,2] = 0.05272440;
>
> ...
>
> end;
>
> failed:
> my.data:2: syntax error in data section
>
>
> Thank you,
>
> Yuri
>
>
>
> _______________________________________________
> Help-glpk mailing list
> [email protected]
> https://lists.gnu.org/mailman/listinfo/help-glpk
>

_______________________________________________
Help-glpk mailing list
[email protected]
https://lists.gnu.org/mailman/listinfo/help-glpk