I have used 'polyfitn' to find polynomials for varying parameters of nonlinear system based on three input variables. Inserting these polynomials in three equations, i have then tried to 'fsolve' them but i couldn't converge to one solution by inserting polynomials of different orders.
I have been going through your file exchange list to look for some other related code. I was wondering if i should try to use some spline method instead of 'polyfitn' but i am not sure how i can insert it in the equation and solve them. Also is their any other method to solve three nonlinear equations simultaneously.