how to make discrete inputs to multi-objective optimazation?

Hello

I try to make muli-objective optimazation for composite structure and the orintaintions of composite layers (which are one of the design varaibles) are not continouse but it takes (0, 45,-45 and 90) so how can i do it in the Matalb.

Thanks for your help in advance

Answer 1

[Walter Roberson]

Use integers constrained from -1 to +2 and multiply by 45.