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Re: Summing all the elements along a dimension in a matrix

• To: mathgroup at smc.vnet.net
• Subject: [mg104303] Re: [mg104288] Summing all the elements along a dimension in a matrix
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Tue, 27 Oct 2009 04:57:25 -0500 (EST)
• References: <200910260425.XAA18560@smc.vnet.net>
• Reply-to: murray at math.umass.edu

A matrix is 2-dimensional and has no "third dimension". Are you trying 
to sum along the 3rd row?  Along the 3rd column?

Or are you talking about a higher-dimensional array?

CuppoJava wrote:
> Hi,
> I just started using Mathematica after a year of experience with
> another system, and I have a question regarding how to handle matrices.
> 
> What is the equivalent code for doing
> sum(A,3) in mathematica?
> This sums all the elements A along the third dimension.
> 
> I'm having a hard time finding it in the documentation.
> 
> Thanks a lot for your help
>   -Patrick
> 

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

• References:
  • Summing all the elements along a dimension in a matrix
    • From: CuppoJava <patrickli_2001@hotmail.com>