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## [Help-glpk] Assertion failed

**From**: |
nghafour |

**Subject**: |
[Help-glpk] Assertion failed |

**Date**: |
Thu, 13 Jul 2006 17:00:52 -0400 |

**User-agent**: |
Internet Messaging Program (IMP) 3.2.8 |

Hi,
I have a problem with running glpk-4.10:
I run the following MIP instance using command (glpsol --cpxlp ~/tmp_prob.lp):
Minimize
obj: x_1
Subject To
r_1: - 1003 x_1 + x_2 >= 0
r_2: - 1999 x_2 + x_3 >= 0
r_3: - 4000 x_3 + x_4 >= 0
r_4: + 8000 x_4 + x_5 <= 0
r_5: + 2 x_5 + x_6 >= 0
r_6: - x_1 <= -1002
r_7: - x_2 <= -1005006
r_8: - x_3 <= 138476654
r_9: - x_4 <= -144165184
r_10: - x_6 <= -1
Bounds
x_1 free
x_2 free
x_3 free
x_4 free
x_5 free
x_6 free
Generals
x_1
x_2
x_3
x_4
x_5
x_6
End
and I get the following output (error):
lpx_read_cpxlp: 10 rows, 6 columns, 15 non-zeros
lpx_read_cpxlp: 6 integer columns, none of which are binary
lpx_read_cpxlp: 32 lines were read
lpx_simplex: original LP has 10 rows, 6 columns, 15 non-zeros
lpx_simplex: presolved LP has 5 rows, 6 columns, 10 non-zeros
lpx_adv_basis: size of triangular part = 5
0: objval = 1.002000000e+03 infeas = 1.000000000e-00 (0)
Assertion failed: spx->p != 0; file glpspx2.c; line 668
It seems like an error in glpk or is there anything I should do to be able to
solve this problem?
Thanks,
Niloufar

**[Help-glpk] Assertion failed**,
*nghafour* **<=**