Wath's the meaning of this error message?
CPLEX 11.2.0: 30 diagonal QP coefficients of the wrong
sign:
Variable
Diagonal
_svar[30]
1
_svar[29]
1
_svar[28]
1
Diagonal QP Hessian has elements of the wrong sign.
I don't understand because my objectiv function is:
maximize compattezza: sum{i in PROF, j in GIORNI, l in CLASSI, k in
TURNIPOS} phi[i,j,l,k]*phi[i,j,l,k];
where phi is a binary variable, and so I think it is convex and
quadratic.
Thank you.
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