scipy equivalent for MATLAB spy

Question

I have been porting code for an isomap algorithm from MATLAB to Python. I am trying to visualize the sparsity pattern using the spy function.

MATLAB command:

Answer 1

Maybe it's your version of matplotlib that makes trouble, as for me scipy.sparse and matplotlib.pylab work well together.

See sample code below that produces the 'spy' plot attached.

import matplotlib.pylab as plt
import scipy.sparse as sps
A = sps.rand(10000,10000, density=0.00001)
M = sps.csr_matrix(A)
plt.spy(M)
plt.show()

# Returns here '1.3.0'
matplotlib.__version__

This gives this plot: