Re: [Help-glpk] Transport model by code

[glpk xypron]

Hello Jose,

to find out if the problem is with the model and data files, please, run
glpsol -m your_problem.mod -d your_data.dat --check --wtxt output.out
and have a look at created file output.out.
(Glpsol is the stand alone solver provided with GLPK.)

A minimum working example file showing 
- reading a problem
- writing with lpx_print_prob
- solving the problem
is

#include "glpapi.h"
int main()
{
  LPX *lp = NULL;
  lp = lpx_read_model("examples/sudoku.mod", "examples/sudoku.dat", NULL);
  lpx_print_prob(lp, "sudoku.out");
  lpx_std_basis(lp);
  lpx_simplex(lp);
  lpx_delete_prob(lp);
}

The example sudoku problem is provided in the source distribution
ftp://ftp.gnu.org/gnu/glpk/glpk-4.29.tar.gz

If You need further assistance, please, send a link to the relevant files or 
add them as attachment.

Best regards

Xypron


-------- Original Message --------
> Hey everyone, I've been playing with GLPK this few days.
> Im trying to pass data to glpk but not from a file, I've been using de
> Reference Manual 4.10 to guide me.
> The problem is that I need to model a transport problem, what I did was to
> create 3 arrays like the manual says.
> 
> What I did was to make a program that would read the model and data from
> files, and after resolving the problem, I used lpx_print_prob() so I would
> compare the problem with the one passed by parameters and not reading any
> file.
> 
> I succed in part of it. The parameter I goes from 1 to 4, J goes from 1 to
> 32, d is a matrix of 4 x 32 ints.
> When the program its executed and lpx_print_prob executed, I only get part
> of the file like the one it was supposed to be.
> Instead of arrays of 128 ints, it seems i need them of 384 ints, but I do
> not know with what data fill the rest.
> 
> I made an experiment adding a coordinate that wasnt in the matrix a[1,33]
> and give him the value of 1.0
> and I got that another parameter was printed in the file, so that gives me
> the idea that I need to keep filling the array with data
> but I dont know where to get more data.
> 
> I do not if you guys understan my problem?
> 
> Thank you,
> 
> -- 
> José I. Monreal Bailey

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