Re: operate a matrix of derivations
- To: mathgroup at smc.vnet.net
- Subject: [mg39470] Re: operate a matrix of derivations
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Mon, 17 Feb 2003 18:17:10 -0500 (EST)
- Organization: The University of Western Australia
- References: <b1l15i$i8o$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <b1l15i$i8o$1 at smc.vnet.net>,
iselig at techunix.technion.ac.il (ilan) wrote:
> I want to make a matrix of derivations, so I will be able to multiply
> it by a matrix of functions and get the result matrix
> simple example:
>
> |d/dx 0 | |xy x| |y 1|
> | |.| |=| |
> |d/dy d/dx| |x+y 3| |x+1 0|
>
> thank you
Here is one way. Matrix of operators:
operator = {{D[#, x]& , 0 # & }, {D[#, y]& , D[#, x]& }}
Matrix of functions:
functions = {{x y, x}, {x + y, 3}}
Compose them:
Inner[Compose, operator, functions]
Cheers,
Paul
--
Paul Abbott Phone: +61 8 9380 2734
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