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Set all elements of a sparse matrix to zero

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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?


Rik on 17 Sep 2020
The easiest way is probably to overwrite them by sparse arrays of the same size.
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
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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