Introduction - If you have any usage issues, please Google them yourself
For unconstrained optimization of the Powell optimization methods, procedures explained in the following parameters:// P: store design variables// XI: storing two linearly independent vector// N: contains N elements of the one-dimensional real array, design variables used to store// NP: plastic variables, used to store P and xi dimension// FTOL: iterative precision// FRET: output parameters, storage of the objective function to find the approximate minimum point value// ITER: number of iterations