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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104311] Re: Summing all the elements along a dimension in a matrix
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Tue, 27 Oct 2009 04:58:54 -0500 (EST)
  • References: <hc38cr$i5b$1@smc.vnet.net>

Hi Patrick,

Many ways to do this, but the easiest way will be using Total. The
syntax variant you could use here is Total[A,{3}].

Perhaps you should check whether the ordering of the dimensions is the
same in both systems.

Cheers -- Sjoerd


On Oct 26, 6:26 am, CuppoJava <patrickli_2... at hotmail.com> 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



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