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MathGroup Archive 1999

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Re: Linear Algebra `MatrixManipulation`

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20015] Re: [mg19982] Linear Algebra `MatrixManipulation`
  • From: BobHanlon at aol.com
  • Date: Sat, 25 Sep 1999 02:40:43 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Robert,

Use parentheses so that it applies the MatrixForm after the assignment rather 
than assigns the MatrixForm to the variable.

(G = {{1, 2}, {3, 4}}) // MatrixForm

(H = {{5, 6}, {7, 8}}) // MatrixForm

G.H

{{19, 22}, {43, 50}}

Bob Hanlon

In a message dated 9/24/1999 4:57:36 AM, scheyder at math.upenn.edu writes:

>When I define two matrices such as G={{1,2},{3,4}}  and H={{5,6,},{7,8}}
>and
>then perform an operation such as multiplication, I get the correct result.
>But, if I add  MatrixForm to each matrix first and then perform the
>operation, the operation is not evaluated.  The output is simply two
>Standard Form expressions with no result.
>


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