Hi,

I'm trying to obtain the maximum value of the function and estimate the values of parameters in this function.

But when I ran the command NMaximize, I got this error:

NMaximize::nrnum: The function value 1.25645*10^6-370.708 I is not a real number at {r,x,\[Theta]} = {0.652468,0.266141,1.36563}. >>

Please see the code in the attachment

Many thanks in advance