How to insert square terms in constraints for fmincon

Hello together,

I want to solve a non-linear model with fmincon. Now some restrictions are squares like x(1)^2 + 2x(2)^2 <=540. How is the correct way to write them in A? A = [1^2 2^2] seems to be the wrong solution.

Could you please give me support?

Answer 1

[Torsten]

You must use function "nonlcon" for this.