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Find position of nonzero elements

• To: mathgroup at smc.vnet.net
• Subject: [mg120317] Find position of nonzero elements
• From: Dominic Wörner <dominic.woerner at mpi-hd.mpg.de>
• Date: Tue, 19 Jul 2011 06:53:55 -0400 (EDT)

Hi,

How can I find the indices i and j of all nonzero elements of a matrix. 
I want that because there are only some nonzero elements in a huge 
matrix.

Best regards,
Dominic 

• Follow-Ups:
  • Re: Find position of nonzero elements
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Find position of nonzero elements
    • From: Sseziwa Mukasa <mukasa@gmail.com>
  • Re: Find position of nonzero elements
    • From: Oliver Ruebenkoenig <ruebenko@wolfram.com>