I have a linprog code that has x1,x2,x3 and x4 in the objective function.
The results I get give me values in the form: x = 6.6667 0.0420 0 0
Which in the case I am trying to model doesn't make physical sense because the x's represent the number of units of a specific technology, and therefore for example 0.0420 doesn't in fact exist. Is there anyway to "force" linprog to find the optimum integer value of x?
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No there isn't. Integer linear programming is a different beast. Perhaps this one from the file exchange might help:
Alternatively, I'm pretty sure there are matlab bindings available for glpk