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## Re: [Help-glpk] [Fwd: Bound not being enforced]

**From**: |
Andrew Makhorin |

**Subject**: |
Re: [Help-glpk] [Fwd: Bound not being enforced] |

**Date**: |
Thu, 16 May 2013 17:18:38 +0400 |

>* I have a MIP defined that is not solving correctly because there is a*
>* bound defined that is not being enforced.*
>* *
>* *
>* I validated the bound is defined correctly. The constraint has an upper*
>* bound of 0. Here is the "row" information after inserting the*
>* constraint:*
>* *
>* *
>* Row: 11*
>* Name: c2_2_1_B*
>* Bound Type: 3 *
>* LB: -1.7976931348623157E308*
>* UB: 0.0*
>* *
>* *
>* But the solution generates with a row value of 42. Here is the*
>* corresponding row output after the solution:*
>* *
>* *
>* Row: 11*
>* Name: c2_2_1_B*
>* Val: 42.0*
>* *
>* *
>* Clearly the bound is violating the UB of 0 defined above. *
>* *
>* *
>* I would be very appreciative of any suggestions.*
>* *
Please provide more detailed information. Not seeing your code it is
difficult to say what is wrong. Did you reoptimize the mip after a row
had been added? You may try to write your mip data in a text file and
then solve it with glpsol to make sure than the mip solver finds correct
solution; if not, please report. Thanks.
Andrew Makhorin