How to create equation for Linear programming

Hello, I have to write a code based on a linear programming. I want to find minimum error. I am calculating the error by below equation.

MAPE(i,1)=mean(abs((At-Ft(2,:))./At))*100; % Calculation the MAPE error

At - constant signal Ft - signal depend on parameter "Nstd", The "Ft" is calculating in other function based on value of "Nstd". "Nstd" range is (0-1). How I can find the best value of "Nstd" based on a Linear Programming to get minimum error "MAPE"

Regards, Jan