Help to preallocate a data structure

I have a for loop in this form

for i = 1:20
  vec(i).q = vector1{i};
  vec(i).w = vector2{i};
end

vector1 and vector2 are cell arrays of vectors. How do i preallocate the structure "vec", and what kind of structure is it?

Answer 1

[Image Analyst]

Try this:

vector = cell(20,1);
vec = struct('q', vector, 'w', vector)

% Check, by assigning some vector and printing it out
vec(13).q = [1,2,3,4] % Assign an array
vec(13).q  % Print to command window.