Fourier series

how to write summation equation in matlab? can i write n ths way?

function [z1,z2,z3,z4,z5]=switching1(x)
  fprintf('enter the value of ');
  n=input('n');
  for i=1:n
      z(1)=1-[(2/pi)*symsum((-1)^i(x(i)-(sin(2*x(i))/2))),1,n]
    z(n)=(2/pi)*[symsum((sin*(n-1)*x(i))/(n-1)-(sin*(n+1)*x(i))/(n+1)),1,n]
  end
  z=(z1-0.2)^2+[z(n)]^2;

[David Young]

Your question seems to reveal many misconceptions, and I think you would do well to review the documentation relating to arrays and matrices in MATLAB before trying to fix this code - go through the introductory material in the users' guide. Note in particular that z(1) is not the same as z1.