How to restrict the search space to integers to solve a multi objective function

I have been using fmincon to minimize a multi objective problem with inequality and equality constraints.As a constarint how can be the data type of the variable be changed to integer.Is there a method to restrict the variables to take only integer values.

Answer 1

[Andrew Newell]

If your problem is linear, you can use mixed-integer LP from the File Exchange. If it isn't, you're on your own (see this thread from MATLAB Newsreader).