[Help-glpk] Problem : basis

[Cedric[FR]]

Hi,

I tested my example of column generation without the routine lpx_std_basis

Now, the result is good:

      0:   objval =   0.000000000e+00   infeas =   1.000000000e+00 (0)
     15:   objval =   3.497400000e+04   infeas =   0.000000000e+00 (0)
*    15:   objval =   3.497400000e+04   infeas =   0.000000000e+00 (0)
*    29:   objval =   2.652371454e+02   infeas =   0.000000000e+00 (0)
OPTIMAL SOLUTION FOUND
*    29:   objval =   2.652371454e+02   infeas =   0.000000000e+00 (0)
*    31:   objval =   6.586143114e+01   infeas =   0.000000000e+00 (0)
OPTIMAL SOLUTION FOUND

But, At the 55 st problem, I obtain:

spx_simplex: initial basis is invalid 

Why? Normally, the precedent solution is feasible

I don't understand spx_simplex because I don't use. How do I repear the
problem?
when the lpx_simplex is different of LPX_E_OK

thanks

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