Re: [Help-glpk] MathProg model processing error

[xypron . glpk]

Hello Robin,

you cannot have "and" in a constraint.

Use two constraints.

Best regards

Heinrich Schuchardt

http://www.xypron.de

Am 28.06.13 um 03:24 schrieb robin hankin

> hello, v4.51, macosx 10.8.3
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> Please help me,  I have a problem and have boiled it down to the following
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> .mod file which exibits the error I am struggling with:
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> wt118:~/Dropbox/glpk/alice_puzzle%
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> wt118:~/Dropbox/glpk/alice_puzzle% cat doesnotwork.mod
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> var x1, integer;
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> var x2, integer;
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> var x3, integer;
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> s.t. ss:   (x1 >= x2) and (x2 >= x3);
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> solve;
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> end;
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> wt118:~/Dropbox/glpk/alice_puzzle% glpsol -m doesnotwork.mod
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> GLPSOL: GLPK LP/MIP Solver, v4.51
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> Parameter(s) specified in the command line:
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>  -m doesnotwork.mod
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> Reading model section from doesnotwork.mod...
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> doesnotwork.mod:5: operand preceding >= has invalid type
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> Context: ...er ; var x2 , integer ; var x3 , integer ; s.t. ss : ( x1 >=
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> MathProg model processing error
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> wt118:~/Dropbox/glpk/alice_puzzle%
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> what is wrong with my doesnotwork.mod file?  What is wrong with my 'ss'
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> constraint?
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> thanks in advance
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> -- 
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> Robin Hankin
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> Uncertainty Analyst
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> address@hidden