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Re: [Help-glpk] [Fwd: Can we set a row with equal upper and lower bound?
Re: [Help-glpk] [Fwd: Can we set a row with equal upper and lower bound?]
Sun, 31 Jul 2011 12:40:42 +0200
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if upper and lower bound are equal the variable is fixed.
Please, use GLP_FX instead of GLP_DB.
On 30.07.2011 05:28, Andrew Makhorin wrote:
-------- Forwarded Message --------
Subject: Can we set a row with equal upper and lower bound?
Date: Fri, 29 Jul 2011 12:07:35 -0700
I am using GLPK now. the version is 4.45. I use it in Cygwin
I have a problem.
I set up a row with upper bound 0 and lower bound 0, the when I run
it. Problem appears.
glp_set_row_bnds(lp, 1, GLP_DB, 0.0, 0.0);
glp_simplex: row 1: lb = 0, ub = 0; incorrect bounds
Then I change the code
glp_set_row_bnds(lp, 1, GLP_DB, 0.0, 0.001);
and it works.
Does this mean that we cannot set both bound equal? But in the GLPK
reference Manual, on page 13, it says "Bounds of variables can be
nite as well as innite. Besides, lower and upper bounds can be equal
to each other."
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