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MathGroup Archive 2001

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Re: Placeholders in matrix notation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg29899] Re: Placeholders in matrix notation
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 18 Jul 2001 02:08:43 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <9j0hhl$fjn$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hmm,

perhaps because {D[#,x],0} is an operator ?
and it has nothing to do with an dot product but

Inner[#1[#2] &, {D[#, x] &, 0*# &}, {f[x], g[x]}]

will work.

Regards
  Jens

"Douglas F." wrote:
> 
> I want to use the partial differential operator in matrix algebra. The function
> it operates on would be in another matrix.
> 
> Here, I am using "d" to represent the partial operator
> {esc}pd{esc}{ctrl-_}x{ctrl-space}
> 
> [d   0] . Transpose[  f[x]|   g[x]  ]
> 
> But Mathematica won't let me do the matrix multiplication. How do you do that?
> 
> -D


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