Can this for loop be vectorized?

2 views (last 30 days)
Snoopy
Snoopy on 28 Feb 2022
Edited: Bruno Luong on 1 Mar 2022
The for loop below runs over the third dimension (page) to fill the alpha array. Is it possible to vectorize this for loop?
alpha_i_h_t = NaN(N_i,N_t,N_draws);
for i = 1:N_draws
alpha_i_h_t(:,:,i) = e_i_h(:,i) + e_h * t;
end
  2 Comments
Torsten
Torsten on 28 Feb 2022
e_i_h(:,i) is a column vector. For e_i_h(:,i) + e_h * t to be defined, e_h * t must be a column vector or a scalar.
So how do you want to write a column vector into a matrix array alpha_i_h_t(:,:,i) ?
Bruno Luong
Bruno Luong on 28 Feb 2022
No Torsen because MATLAB auto-expansion.

Sign in to comment.

Accepted Answer

Bruno Luong
Bruno Luong on 28 Feb 2022
Edited: Bruno Luong on 28 Feb 2022
e_i_h_reshape = reshape(e_i_h,N_i,1,N_draws);
alpha_i_h_t = e_i_h_reshape + e_h * t;
  3 Comments
Torsten
Torsten on 28 Feb 2022
And why do you need a three-dimensional array for a two-dimensional content ?
Or do I get something wrong ?
Bruno Luong
Bruno Luong on 1 Mar 2022
Edited: Bruno Luong on 1 Mar 2022
The result is 3D, each page contains a matrix sum of column by row vector.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!