Plotting sparsity pattern of a matrix

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Fayas Ahamed
Fayas Ahamed 2019-6-3
评论： Fayas Ahamed 2019-6-4
Hi Guys,
I want to visualize the sparsity pattern of a sparse matrix using the function spy().All elements in this matrix is approximated to 4th digit (example : 0.0031,0.0000). The spy() function does not identify 0.0000 or -0.0000 s as absolute zeros. I mean the pattern seems to be dense. How can I overcome this issue? please help me.

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Matt J
Matt J 2019-6-4
spy(abs(yourMatrix)>=0.0001)

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KSSV
KSSV 2019-6-4
YOu can plot the required sparsity using different colors and markers. This might help.
A = rand(10) ;
figure
hold on
spy(A<0.5,'r')
apy(A>0.5,'b')

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