looking for a symbolic matrix calculus package

*To*: mathgroup at smc.vnet.net*Subject*: [mg31462] looking for a symbolic matrix calculus package*From*: friendly at hotspur.psych.yorku.ca (Michael Friendly)*Date*: Wed, 7 Nov 2001 05:29:39 -0500 (EST)*Organization*: York University*Sender*: owner-wri-mathgroup at wolfram.com

I'm looking for a Mathematica package to do symbolic matrix calculus, e.g., where one could declare vectors (x, y, ...) as having shape n x 1, matrices (A, B, ...) as shape n x n, and get things like Derivative[ a . x, x] ==> a Derivative[ x . x, x] ==> 2 x Derivative[ Transpose(x) . A . x, x] ==> 2 A . x etc. I have seen some packages for tensors and tensor calculus, but they are way to complex for my needs. A direct reply email would be appreciated. thanks, -- Michael Friendly Email: friendly at yorku.ca (NeXTmail OK) Psychology Dept York University Voice: 416 736-5115 x66249 Fax: 416 736-5814 4700 Keele Street http://www.math.yorku.ca/SCS/friendly.html Toronto, ONT M3J 1P3 CANADA