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Accessing order pair from sparse matrix

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Marcus Rosales
Marcus Rosales on 27 Mar 2021
Commented: Marcus Rosales on 27 Mar 2021
Hello, my question has to do with accessing the indicies of a sparse matrix. Say we define $S=sparse(M)$, then if we put S in the command lines we'd see something like this (for example):
(1,3) 5
(2,4) 1
(2,5) 3.1415
etc...
Is there a way to just access the order pairs directly? I have two matricies with corresponding elements and want to perfome some tests around the nonzero elements of a figure I am working on. This alone would greatly simplified my code but I can not find any documentation on it...

Accepted Answer

Jan
Jan on 27 Mar 2021
Edited: Jan on 27 Mar 2021
Do you want to get the indices of the non-zero elements?
[i,j,s] = find(S);
The is taken from
help sparse
  1 Comment
Marcus Rosales
Marcus Rosales on 27 Mar 2021
Yes! This'll make my code much faster. Thanks!

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More Answers (1)

Matt J
Matt J on 27 Mar 2021
Edited: Matt J on 27 Mar 2021
yes, just use find().
[I,J,Vals]=find(S);

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