why does it take forever to generate some matrices in the Matlab gallery?
2 views (last 30 days)
Show older comments
Viviana Arrigoni
on 28 Jan 2019
Commented: Viviana Arrigoni
on 1 Feb 2019
I interrupted the execution of
gallery('randcorr',n)
and
A = gallery('toeppd',n,n,rand(n,1),rand(n,1));
for n = 10000 after almost one hour. I know my computer is not the fastest, but for other matrices in the gallery, it would take seconds.
0 Comments
Accepted Answer
Matt J
on 28 Jan 2019
Edited: Matt J
on 28 Jan 2019
Because some of the matrix types in the gallery are computationally expensive to construct. In particular, in
A = gallery('toeppd',n,n,rand(n,1),rand(n,1));
you are asking for the summation of 10000 matrices, where each matrix is itself 10000 x 10000. That is a lot of number crunching.
More Answers (0)
See Also
Categories
Find more on Creating and Concatenating Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!