[Bonmin] Bonmin (1.3.2) bug

[Kashif Rashid]

Hi,

I would like to report a bug encountered in Bonmin (stable release 1.3.2) and was
wondering if others are aware of this, and if it has in fact been fixed in later versions?


For a simple 2v problem:

F(X) = (x1-8)^2 + (x2-2)^2

with 0<xi<10 (i=1,2)   and   Xstart = [5 5]

If X is assumed continuous, the solution [8,2] with F = 0 is obtained trivially.

However, if X is integer, Bonmin crashes at the following call:

CoinIotaN(&sortedIndex[0], nnz_jac_g, 0);

in BonminHeuristicDiveMIP with a 'vector subscript out of range' error.


Thus, the problem concerns the use of integer variables and a zero value for nnz_jac_g (the
number of nonzeros in the jacobian of the constraints) when no constraints are applied. If any
one constraint is added, this problem does not appear.

Is there a known fix to this problem?

Thanks and Regards,
Kashif
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