Please, people, need help! I have a harmonic function which is a product of cosines (something with many cos(k*phi)) and it can be represented as a finite series with only cos terms... We know it... Now. Every step we multiply this function by one more cos and want to find the Fourier coefs. So, I don't understand two things... 1. There is no any method in Matlab to generate functions of variables as I understand... So, how can I provide this updating? I need that function of phi... 2. Is there any command for finding nth Fourier coefficient of function, not a vector? Any useful tips?