RE: Matrix inverse not evaluating
- To: mathgroup at smc.vnet.net
- Subject: [mg41626] RE: [mg41593] Matrix inverse not evaluating
- From: "David Park" <djmp at earthlink.net>
- Date: Thu, 29 May 2003 08:13:51 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Gregory,
You are not giving us the full details. But I can guess.
The following works...
V = {{1, 2, 3}, {3, 2, 1}, {1, 0, 2}};
Inverse[V]
{{-(1/3), 1/3, 1/3}, {5/12, 1/12, -(2/3)},
{1/6, -(1/6), 1/3}}
I think the following is what you probably did...
V = {{1, 2, 3}, {3, 2, 1}, {1, 0, 2}} // MatrixForm
matrix display
Inverse[V]
Inverse[matrix display]
Inverse does not evaluate when MatrixForm is wrapped around the matrix.
One solution is to write your initial definition this way...
(V = {{1, 2, 3}, {3, 2, 1}, {1, 0, 2}}) // MatrixForm
matrix display
Inverse[V]
{{-(1/3), 1/3, 1/3}, {5/12, 1/12, -(2/3)},
{1/6, -(1/6), 1/3}}
The parentheses ensure that V is defined without the MatrixForm wrapper.
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: Gregory Lypny [mailto:gregory.lypny at videotron.ca]
To: mathgroup at smc.vnet.net
Yet another newbie question: I have a 3x3 matrix called V, filled with
numbers, whose output displays correctly. However, when I enter
Inverse[V] the output displayed is not the answer but the word Inverse
followed by the the argument matrix as Inverse[(elements of V)]. What
am I doing wrong? Gregory