Please help: How to assert that an object is a matrix ???
- To: mathgroup@smc.vnet.net
- Subject: [mg11969] Please help: How to assert that an object is a matrix ???
- From: Paul Bunyk <paul@pbunyk.physics.sunysb.edu>
- Date: Fri, 17 Apr 1998 02:21:18 -0400
- Organization: SUNY @ Stony Brook
Hi, everyone!
I'm trying to analyse the block structure of a matrix in Mathematica to
figure out the best way to solve a system with this matrix.
For example I write
A := {{GL,0,0,0,IL[1]},
{GT,0,0,0,0},
{0,GL,0,0, IL[2]},
{0,GT,0,0,0},
{0,0,GL,0,IL[3]},
{0,0, GT,0,0},
{0,0,0,GL,IL[4]},
{0,0,0,GT,0}}
X := {XP1,XP2,XP3,XP4,XL}
B := {0,PT[1],0,PT[2],0,PT[3],0,PT[4]}
where GL, GT, IL, etc., are not elements but (sub-)matrices themself. I
want to perform algebraic transformations on A, but I want element
multiplication to be non-commutative and inversion to use Inverse
rather than 1/element.
Can I somehow trick Mathematica to assume that elements are matrices?
Any help is appreciated!
Paul
--
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