Placeholders in matrix notation

*To*: mathgroup at smc.vnet.net*Subject*: [mg29892] Placeholders in matrix notation*From*: dooglefish at aol.communicate (Douglas F.)*Date*: Tue, 17 Jul 2001 01:00:37 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

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

**Follow-Ups**:**Re: Placeholders in matrix notation***From:*"Hugh Philipp" <hph@com.dtu.dk>