How do I extract subscript numbers from a matrix element?

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Victor Noronha
Victor Noronha 2014-6-10
评论： Victor Noronha 2014-6-10
Hi, I have a sparse matrix V as you can see.
What I want to do is to extract the rows' subscript numbers and put into a vector matrix X. Example: X = (108, 120, 127, n, ...).
And do the same to col's subscript numbers, putting it into Y = (1, 1, 1, 2, 2, n, ...)
Than, simply plot it using plot(X, Y);
Thank you in advance!

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采纳的回答

José-Luis
José-Luis 2014-6-10
编辑：José-Luis 2014-6-10
[row,col] = find(V);
plot(row,col,'r+');

更多回答（1 个）

Jos (10584)
Jos (10584) 2014-6-10
help find
V = sparse(rand(5)>.5)
[x,y] = find(V)
plot(x,y,'b.')
and take a look at
help spy
spy

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