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MathGroup Archive 1999

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Re: Linear Algebra `MatrixManipulation`

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20008] Re: Linear Algebra `MatrixManipulation`
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sat, 25 Sep 1999 02:40:39 -0400
  • Organization: Universitaet Leipzig
  • References: <7se6t8$qsv@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

MatrixForm[] is wrapped arround your expression if you give

G = MatrixForm[{{1, 2}, {3, 4}}]

than 

FullForm[G]

MatrixForm[List[List[1, 2], List[3, 4]]]


Since MatrixForm is only for printing/Output 

MatrixForm[] prevent all matrix operations.

Remove the MatrixForm[] and set the Cell | Default Output Format 
to TraditionalForm to see the printed matrix.

Hope that helps
  Jens

"Robert F. Scheyder" wrote:
> 
> Hi,
> 
> Maybe someone can help me.
> 
> 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.
> 
> I appreciate any help.
> 
> Robert
> 
> --


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