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## Re: [Help-glpk] How to solve a dual problem

**From**: |
glpk xypron |

**Subject**: |
Re: [Help-glpk] How to solve a dual problem |

**Date**: |
Thu, 18 Mar 2010 21:18:00 +0100 |

Hello David
>* *
>* We´ve tryed the glp_get_row_dual and glp_get_col_dual*
>* but the number of rows and cols doesn´t seem to correspond to the dual*
>* problem.*
>* *
glp_get_row_dual and glp_get_col_dual retrieve the dual values
of the original rows and columns.
You get the matrix of the dual problem by transposition,
exchanging rows and columns.
http://en.wikipedia.org/wiki/Linear_programming#Duality
Best regards
Xypron
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