Set all elements of a sparse matrix to zero

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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?
James Tursa
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
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.

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Accepted Answer

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

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