Re: [Help-glpk] A Simple MIP model in MathProg - (simple cplex mip model included)

[Raniere Gaia Silva]

Maybe it answer your question:

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param number := 4;

set NUMBER := {1..number};

var x{n in NUMBER};

s.t. c1: - x[1] + x[2] + x[3]+ 10 * x[4], <= 20;
s.t. c2: x[1] - 3 * x[2] + x[3], <= 30;
s.t. c3: x[2] - 3.5 * x[4], == 0;
s.t. x1: 0 <= x[1] <= 40;
s.t. x4: 2 <= x[4] <= 3;

maximize obj: x[1] + 2 * x[2] + 3 * x[3] + x[4];

end;

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Once your problem is a MIP, for the integer variables you must use:

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var x{n in NUMBER}, integer;

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And for binary variables:

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var x{n in NUMBER}, binary;

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Raniere