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MathGroup Archive 2001

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Re: column * row ??

  • To: mathgroup at smc.vnet.net
  • Subject: [mg28850] Re: column * row ??
  • From: phbrf at t-online.de (Peter Breitfeld)
  • Date: Tue, 15 May 2001 00:59:24 -0400 (EDT)
  • References: <9dlcc6$o2p@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

J.R. Chaffer <jrchaff at mcn.net> schrieb:
> Hi there,
> 
> Can someone tell me a way to mimic the building of
> an N x N matrix by multiplying a column vector
> on left times a row vector on right ? (both vectors
> of length N) - I mean in Mathematica, of course.
> 
> i.e, want the result,
> 
> (colvec){a1,a2, .. aN} * (rowvec){b1,b2,..bN} =
> 
> result is matrix:
> 
> {{a1*b1  a1*b2 .....  a1*bN},
>  {a2*b1  a2*b2 .....  a2*bN},
>   ...     ...          ...  ,
>  {aN*b1  aN*b2 .....  aN*bN}}
> 
John,
try Outer[Times, colvec, rowvec]


Gruß Peter
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 Peter Breitfeld, Bad Saulgau, Germany   Meinen GnuPG/PGP-5x Key gibts dort



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