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MathGroup Archive 2000

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Re: vector multiplication

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25537] Re: vector multiplication
  • From: "Hans Staugaard" <hans.staugaard at get2net.dk>
  • Date: Sat, 7 Oct 2000 03:35:41 -0400 (EDT)
  • References: <8rjjdh$ofq@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hello

First I make a sample matrix:

In[1]:=
v = Array[Plus, {5, 3}]

Out[1]=
{{2, 3, 4}, {3, 4, 5}, {4, 5, 6}, {5, 6, 7}, {6, 7, 8}}

Then pick out the diagonal elements:

In[2]:=
Tr[Transpose[v].v, List]

Out[2]=
{90, 135, 190}


Hans

<Yannis.Paraskevopoulos at ubsw.com> wrote in message
news:8rjjdh$ofq at smc.vnet.net...
> Hi there,
>
> Could you please help me with the following:
>
> Assume the v is a vector (1xk). I would like to calculate the v'v and
> then take all the diagonal elements.
>
> Thanks a lot in advance for your effort.
>
> yannis
>
>
> Visit our website at http://www.ubswarburg.com
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