Hello gamsworld,
once more I’m in desperate need of your help.
What I’m trying to do? I have a regular OR-problem (WLP) which runs smoothly in GAMS. I want to create several .txt-files using the put and putclose-commands in order to have a file for every decision variable. I use $exit after a putclose and before the declaration of a new file.
What’s the problem? Although I want (a total of) four files to be created by GAMS, only the first one is actually in my folder. The others do not seem to have been created.
Are there any visible error messages? No, not one.
Here’s the code I use for creating the output-files. I’ll skip the model itself.
Model TwoStageWLP /all/ ;
$include “twostagewlp.inc” ;
option optcr=0.0;
Solve TwoStageWLP using mip minimizing Z ;
display y.l;
display x_w.l;
display x.l;
file output1 / “objective.txt” /;
put output1;
put 'Value of Objective Function: ',Z.l;
putclose output1;
$exit
file output2 / “locations.txt” /;
put output2;
put ‘Locations of Warehouses’;
put / /;
loop(i,
if (y.l(i) = 1,
put 'Location of Warehouse: ', i.te(i) /
);
);
putclose output2;
$exit
file output3 / “transport_fac_ware.txt” /;
put output3;
put ‘Transport Quantities from Factories to Warehouses’;
put / /;
loop (h,
loop(i,
if (y.l(i) = 1 AND x_w.l(h,i) 0,
put h.te(h), ’ to ', i.te(i), x_w.l(h,i) /
);
);
);
putclose output3;
$exit
file output4 / “transport_ware_cust.txt” /;
put output4;
put ‘Transport Quantities from Warehouses to Customers’;
put / /;
loop (i,
loop(j,
if (y.l(i) = 1 AND x.l(i,j) 0,
put i.te(i), ’ to ', j.te(j), x.l(i,j) /
);
);
);
putclose output4;
Any help is appreciated. Thanks in advance! 
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