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[Bug-glpk] Problem in the MIP problem


From: Cedric[FR]
Subject: [Bug-glpk] Problem in the MIP problem
Date: Fri, 17 Oct 2008 14:17:04 +0300

Hi,

I have a problem for integer variables with a lower bound equal at upper
bound.

I obtain this error message:

lpx_intopt: column 1 has incorrect bounds

My problem is:

PROBLEM: spConf_ whose formulation ref number is 1
Minimize
 Objectif: -11.6667 Yi0_copy -11.6667 Yi1_copy -5 Yi2_copy
 -5 Yi3_copy -2.7 Yi4_copy -4.6 Yi5_copy -4.6 Yi6_copy -4.6 Yi7_copy
 -21.5 Yi8_copy -21.5 Yi9_copy
Subject To
 RTBH____: +7 Yi0_copy +7 Yi1_copy +2 Yi2_copy +2 Yi3_copy
 +2 Yi4_copy +4 Yi5_copy +4 Yi6_copy +4 Yi7_copy +9 Yi8_copy
 +9 Yi9_copy <= 10

Bounds
 1 <= Yi0_copy <= 1
 0 <= Yi1_copy <= 1
 0 <= Yi2_copy <= 1
 0 <= Yi3_copy <= 1
 0 <= Yi4_copy <= 1
 0 <= Yi5_copy <= 1
 0 <= Yi6_copy <= 1
 0 <= Yi7_copy <= 1
 0 <= Yi8_copy <= 1
 0 <= Yi9_copy <= 1

Integers

 Yi0_copy  Yi1_copy  Yi2_copy  Yi3_copy  Yi4_copy  Yi5_copy  Yi6_copy 
Yi7_copy 
 Yi8_copy  Yi9_copy 
End

Why?

Though, I use this function to include bound for the first variable:

glp_set_col_bnds(glpkProbPtr,id+1,GLP_FX,dlb[id],dub[id]);

Thanks

C├ędric

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