# Set all elements of a sparse matrix to zero

2 views (last 30 days)
NA on 17 Sep 2020
Answered: Bruno Luong on 18 Sep 2020
I have 4 sparse matrices A, B, C, and D .
ABCD = [A B; C D];
How can I set the all elements of the sparse matrix B and C to zeros?
##### 3 CommentsShow 1 older commentHide 1 older comment
James Tursa on 17 Sep 2020
Do you mean you have ABCD and want to 0 out the parts originally associated with the B and C spots? Or do you mean you have A and D and want to built ABCD with effectively 0 for the B and C spots?
Bruno Luong on 17 Sep 2020
Edited: Bruno Luong on 17 Sep 2020
Strictly speaking, your question is trivial to answer!
B(:) = 0;
C(:) = 0;
I challenge you to tell me why this doesn't answer your question.
Just to show how your question is in fact ill-formulated.

Bruno Luong on 18 Sep 2020
B(:) = 0;
C(:) = 0;

### Categories

Find more on Sparse 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!