Hi,

i’m trying to solve an miqcp problem with binary and real variables. And the value of the objective function given by the solver

is really diffÃ©rent from my hand made calculation.

to be much clear here is my problem description:

variable: Positive variable x(var)

binary variable u(var)

objectiv: “obj… z =E=sum((var), (x(var)*u(var)*mat_kp(var)));”

mat_kp=

5E-11 5E-11 1.25E-10 1.25E-10 1.5E-10 1.5E-10 2.5E-11 2.5E-11 1.25E-10 1.25E-10 1.5E-10 1.5E-10 2.5E-11 2.5E-11 1.25E-10 1.25E-10 7.5E-11 7.5E-11 2.5E-11 2.5E-11 0 0 0 0 0 0 0 0 0 0 0 0 3E-10 3E-10 1.75E-10 1.75E-10 2.25E-10 2.25E-10 5.5E-10 5.5E-10 2E-10 2E-10 2.75E-10 2.75E-10 1.5E-10 1.5E-10 7.5E-11 7.5E-11 2.25E-10 2.25E-10 7.5E-11 7.5E-11 7.5E-11 7.5E-11 1.75E-10 1.75E-10 2.5E-11 2.5E-11 2.5E-10 2.5E-10 3E-10 3E-10 3.25E-10 3.25E-10 4.75E-10 4.75E-10 4.75E-10 4.75E-10 2.75E-10 2.75E-10 0 0 5.5E-10 5.5E-10 8E-10 8E-10 6E-10 6E-10 1.5E-10 1.5E-10 5E-11 5E-11 0 0 0 0 0 0

So my problem is that when i check the given solution (set of X and U) by calculating it manually X*U*mat_kp i don’t have the same result,

i firstly thought about approximation, but the difference is to big.

So i wanted to know why this supposedly optimal objective value is different from the hand made calculation with the same set of variables.

## Regards

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