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Re: [Help-glpk] Multi-ranged column bounds
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From: |
Andrew Makhorin |
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Subject: |
Re: [Help-glpk] Multi-ranged column bounds |
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Date: |
Sun, 14 Feb 2010 21:46:30 +0300 |
> How do I express the following semi-continuous variable x in GLPK:
> 5 * z <= x <= 10 * z
> I cannot just do:
> glp_set_col_kind(lp, z, GLP_BV);
> glp_set_col_kind(lp, x, GLP_CV);
> glp_set_col_bnds(lp, x, GLP_DB, z*5.0, z*10.0);
You need to create two inequality constraints:
x - 5 * z >= 0
x - 10 * z <= 0