MATLAB

Develop a vectorized version of the following code:
tst = 0; tnd = 20; ni=5;
t(1)=tst;
y(1)=15 + 5*cos(2*pi*t(1)/(tnd-tst));
for i=2:ni+1

t(i) = t(i-1) + (tnd - tst)/ni;
y(i) = 15 + 5*cos(2*pi*t(i)/(tnd - tst));
end
Write this as an M-file. Here, you are supposed to be slick and get rid of the for-loop. Hint:
x=2:4:10 is the vectorized version of the for-loop
for i = 1:3
x(i) = 2+4*(i-1);
end