The compare function compares the contents of two MPC objects MPC1, MPC2.
If the design specifications (models, weights, horizons, etc.) are
identical, then yesno is equal to 1.
Notecompare may return yesno = 1 even
if the two objects are not identical. For instance, MPC1 may
have been initialized while MPC2 may have not,
so that they may have different sizes in memory. In any case, if yesno
= 1, the behavior of the two controllers will be identical.