I want to minimize a non-linear system of equations. I'm using fsolve from the optimization toolbox version 2.0. There are about 100 parameters to be calculated iteratively. The equation is of cubic type (F(x,x^3)=0) and there are problems to find adequate solutions even though the starting values of the 100 parameters are quite close to the expected values. I tried to change the options (TolPCG and PrecondBandWidth) but that didn't help. My questions are:
1. Does anybody have experience with that kind of non-linear equations? 2. Are there other possibilities to calculate the parameters of such a non-linear system of equations iteratively using MATLAB?