How can I use loop for summation of cosines?

Hi: I was trying to take the following sum, y = sum over f's (harmonics) of cos(2*pi*f*t) using this loop: t = -1:.001:1; f = 1:10 for y = sum (cos(2*pi*f*t), f) end plot (t,y) But it's leading to errors! Can anyone please advise? Thanks. Arijit

[Purushottama Rao]

loop variable for loop is not defined. Futher more in your eqn, f is an array of size 10, and t is an array of size 2001. How do you want to iterate y?

Answer 1

[Walter Roberson]

sum() of something that is numeric in its first argument must either have no second argument or the second argument must be the dimension number.

symsum() of a symbolic expression expression allows a variable and a range of values

But what you need is bsxfun() to calculate the table of values and then to sum() along the appropriate dimension