[Matplotlib-users] Ploting a sparse matrix with imshow

[Jose G. <sjm...@go...>]

Dear matplotlib users,

I am trying to plot a nxn symetric matrix containing zeros (in white) 
and ones (in black). Quite simple, I guessed. For that I use imshow as 
follows:

 >>> imshow(W, cmap=cm.binary) # W is a Numpy Array with shape (100,100)

However, this does not work the way i would like (the ones appear very 
blur). I would need the correct representation of a grid where the 
possition 0,0 is simply the entry W[0,0] of my array.

There should be an easy way to plot this matrix, bu I cannot figure it out.

Thanks for your help in advance.

Jose