MATLAB: Array indices must be positive integers or logical values

Question

H = 0;
M = length(h);
for k=0:M-1
    H = H + (h(k) * exp(-1i*2*pi*fd));
end
%fd and h come from a function call

Answer 1

The problem:

for k=0:M-1

The solution:

for k=1:M

In MATLAB, subscript indices begin at 1, not 0, and are defined as integers greater than 0.

It is more efficient to do this without the loop:

H = cumsum(h* exp(-1i*2*pi*fd));

or simply:

H = sum(h* exp(-1i*2*pi*fd));