Efficient Array Preallocation in MATLAB

Question

One of the first things one learns about programming efficiently in MATLAB is to avoid dynamically resizing arrays. The standard example is as follows.

N = 1000;         


        

Answer 1

How about letting Matlab take care of the allocation for you?

clear a;
for i=N:-1:1
    a(i) = cos(i);
end

Then Matlab can allocate and fill the array with whatever it thinks will be optimal (probably zero). You don't have the debugging advantage of NaNs, though.