[Help-glpk] Error:unable to factorize basis matrix

[Alexander Schnell]

Hello,

i`m using pymathprog 0.3 and when trying to solve a big Binary Integer Program, 
i get the following error message and the evaluation stops:

: obj =  2.719712443e+007  infeas = 9.756e+001 (1409)
  80200: obj =  2.719712443e+007  infeas = 9.756e+001 (1409)
  80400: obj =  2.719712443e+007  infeas = 9.756e+001 (1409)
  80600: obj =  2.719712443e+007  infeas = 9.756e+001 (1409)
  80800: obj =  2.719712443e+007  infeas = 9.756e+001 (1400)
  81000: obj =  2.723652533e+007  infeas = 8.235e+001 (1376)
  81200: obj =  2.723652533e+007  infeas = 8.235e+001 (1369)
Warning: numerical instability (primal simplex, phase I)
  81259: obj =  2.723652533e+007  infeas = 8.235e+001 (1368)
Warning: numerical instability (primal simplex, phase I)
  81299: obj =  2.723652533e+007  infeas = 8.235e+001 (1368)
  81400: obj =  2.723810723e+007  infeas = 7.967e+001 (1361)
Error: unable to factorize the basis matrix (1)
Sorry, basis recovery procedure not implemented yet
ios_driver: unable to solve current LP relaxation; glp_simplex returned 5
+ 81411: mip =     not found yet >=  2.618187908e+007        (341; 1)
glp_intopt: cannot solve current LP relaxation 

What does this mean? Has it something to do with the numerical instability 
warning?

Best Regards,
Alex
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