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Re: Placeholders in matrix notation


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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