[Help-glpk] 4.54 sgf_reduce_nuc triggers assertion on line 165 of sgf.c

[Erik Quaeghebeur]

Hi,


Consider the simple problem

p lp min 1 1 0
i 1 d -1 1
n i 1 constraint
j 1 f
n j 1 variable
e o f
        
Standard, the variable is non-basic fixed at lower bound and the 
constraint is basic. When I set the variable as basic and constraint as 
non-basic, I get, when warming up the basis:

Assertion failed: k1 < k2
Error detected in file <path>/glpk-4.54/src/bflib/sgf.c at line 165

Is this expected? (I was expecting an error code signaling an invalid 
basis at the worst.)


Best,

Erik