Get the real function output to simplify without the real function in the output.

I am trying to get matlab to take the real part of a function. However, I want the output to not contain the real function in the answer. I am trying to do this for optimization via BARON and BARON does not handle having the real function in the objective function. The variables I am dealing with are real and nonnegative, and I declare the symbolic variables to be as such. How do I get the real function output to not contain the real function.

Answer 1

[Jonas]

realPart=z-imag(z);

has no real() function

[Jordan Armstrong]

The same issue happens when using the imag() function on our equation.

[Jonas]

i dont know about that function, what about abs(z)*cos(angle(z)) or 0.5*(z+z')