Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

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>