Re: vector multiplication
- To: mathgroup at smc.vnet.net
- Subject: [mg26123] Re: vector multiplication
- From: Heiko_Petermann at t-online.de (Heiko)
- Date: Tue, 28 Nov 2000 01:56:08 -0500 (EST)
- References: <8rjjdh$ofq@smc.vnet.net> <wTQD5.96470$Zh6.258511@ralph.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Hello,
i'm using mathematica 3.0 and tried to follow the example but it
didn't work for me. Is the Funktion Tr[...]new in version 4 or
selfdefined.
Thanks for reply.
Heiko
On Sun, 08 Oct 2000 02:22:20 GMT, "Hans Staugaard"
<hans.staugaard at get2net.dk> wrote:
>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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>
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>