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## Re: [Help-glpk] Building a graph on the fly

**From**: |
glpk xypron |

**Subject**: |
Re: [Help-glpk] Building a graph on the fly |

**Date**: |
Tue, 17 Apr 2012 21:14:49 +0200 |

Hello Sylvain,
glp_arc and glp_vertex both have a field data in which information like
double a_cap; // arc capacity
double a_cost; // arc cost
double a_low; // lower bound
double a_x; // arc flow
int v_cut; // 0: node is unlabelled, 1: node is labelled
double v_pi; // node potential
double v_rhs; // supply/demand value
int v_set; // 0: vertex is in set R, 1: vertex is in set S
is stored.
glpk.h does not provide structures with these fields.
I will have to change the GLPK for Java code to provide these structures and
the constants needed (length of the data fields, and offsets).
Best regards
Xypron
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