Using matlab to find fourier series coefficients ak

Hello, can anyone please help me with this? I need a function that recieves a vector x which represent x[n] and return Fourier series coefficients ak (ak is a vector also or in matrix form) The equation i need to use is 1/N sum x.e^(-i*2*pi*k*n) sum from n=0 to N-1, k= 0, 1, 2, 3... Im not sure how to receive vectors (matrix?) or make a return of vectors. I know I just need a for loop of 0 to N-1 for the summation once i receive the x. Thank you.