[Help-glpk] Status of basic solution

[Olivier Liess]

Hi,

I'm writing a procedure where I make some modifications to the basis of 
a simplex tableau by pivoting pairs of variables (using the 
lpx_set_[col|row]_stat and lpx_warm_up functions). I then check the 
status of the basic solution I obtain using lpx_get_status.
One of the status that can be reported by GLPK is: LPX_UNDEF, "solution 
is undefined". Does anyone know what this means for GLPK, please ?

Thanks in advance,

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Olivier Liess