MathGroup Archive: July 2011 [00410]

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Re: Find position of nonzero elements

To: mathgroup at smc.vnet.net
Subject: [mg120377] Re: Find position of nonzero elements
From: Sseziwa Mukasa <mukasa at gmail.com>
Date: Wed, 20 Jul 2011 06:34:33 -0400 (EDT)
References: <201107191053.GAA10147@smc.vnet.net>

Position[matrix,Except[0]]

If it's machine precision you may need to do

Position[matrix,Except[0.]]

On Jul 19, 2011, at 6:53 AM, Dominic W=F6rner wrote:

> 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
>

References:
- Find position of nonzero elements
  - From: Dominic Wörner <dominic.woerner@mpi-hd.mpg.de>

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