How can i extract the value of an element of a sparse double?

36 views (last 30 days)
if i have a sparse duble:
M = zeros(3);
M = sparse(M);
M(3,3) = 2;
and i want to get only the value of M(3,3) = 2, how do i do that?
if i type:
M(3,3)
i get:
ans =
(1,1) 2
but i want to somheow get:
ans =
2
converting to full matrix is not an option since the actual matrix is 50000 x 50000. thank you

Accepted Answer

Bruno Luong
Bruno Luong on 18 Oct 2020
full(M(3,3))

More Answers (2)

Rik
Rik on 18 Oct 2020
You can convert the result to a full matrix. Indexing only extracts part of the array, but doesn't influence the sparse property.
  2 Comments
Odin Iversen
Odin Iversen on 18 Oct 2020
so like this:
full(M(3,3))
this only converts that one element to full and not the whole M-matrix in the process?
Rik
Rik on 18 Oct 2020
Exactly, which is probably why you accepted Bruno's answer.

Sign in to comment.


Ameer Hamza
Ameer Hamza on 18 Oct 2020
Or maybe this
M(3,3)+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!