Syntax error with Glpk: MathProg model processing error

Question

This is my model:

set linhas;
set colunas;
param c{j in colunas};
param A{i in linhas,j in colunas};
param b{i in linhas};

var x{j in colunas}>=0;

minimize FO:
   sum{j in colunas} c[j]*x[j];

s.t. R{i in linhas}:
   sum{j in colunas} A[i,j] = b[i];

end;

I got the following error when solving the model with glpsol:

Arquivo1.txt:3: syntax error in parameter data block
Context:  set linhas ; set colunas ; param c {
MathProg model processing error.

Can you help me? I could not find what's wrong with this code.

Can you post what you have in 'Arquivo1.txt' file?

serge_k
– serge_k

2016-01-28 17:34:12 +00:00
Commented Jan 28, 2016 at 17:34 — serge_k
– serge_k, Commented Jan 28, 2016 at 17:34
are your rows/constraints missing x variables?

vcp
– vcp

2016-03-01 06:02:35 +00:00
Commented Mar 1, 2016 at 6:02 — vcp
– vcp, Commented Mar 1, 2016 at 6:02

Arton Dorneles · Accepted Answer · 2016-03-11 23:42:25Z

0

This problem occurred because you provided to the solver a model file also as a data file, i.e., you invoked glpsol using the following command-line:

glpsol -m Arquivo1.txt -d Arquivo1.txt

In order to solve the syntax error you need to provide a data file, e.g. Arquivo1.dat, to the option -d that is different from your model . In the data file you must provide concrete data to your sets colunas and linhas, as well as to your parameters a, b, and c. Once you have a data file, you can run:

glpsol -m Arquivo1.txt -d Arquivo1.dat -o solution.sol

Last but not least, enjoy the solution provided in solution.sol.

edited Mar 11, 2016 at 23:42

answered Mar 11, 2016 at 23:31

Arton Dorneles

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2 Comments

Arton Dorneles Over a year ago

Hi @MarOli if this or any answer has solved your question please consider accepting it by clicking the check-mark. This indicates to the wider community that you've found a solution and gives some reputation to both the answerer and yourself. There is no obligation to do this.

Mar Oli Over a year ago

Done. Thanks! @Arton Dorneles

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