How to run a gamultiobj problem in matlab based on merely integer inputs

Dear All,

I want to solve a multi-objective problem with gamultiobj toolbox in matlab. I have four input parameters which all of them should be integer.

x1, x2, x3 and x4.

the problem is that I want the gentic algorithm run with only integer parameters but I can not take control of this matter.

To elaborate on is matter, I do not want this code run based on (for example x1=4.2)

I know its not a complex matter in matlab. But I could not find a solution for that. I would appreciate yout support in advance