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Re: Transpose matrix does not work when MatrixForm is used, why?

• To: mathgroup at smc.vnet.net
• Subject: [mg45221] Re: Transpose matrix does not work when MatrixForm is used, why?
• From: drbob at bigfoot.com (Bobby R. Treat)
• Date: Sun, 21 Dec 2003 03:42:14 -0500 (EST)
• References: <bruqrt$t0p$1@smc.vnet.net> <bs1b8r$9m0$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Here's a "fix" -- add it to your Init.nb file:

Unprotect[Transpose ];
Transpose[MatrixForm[a_]] := MatrixForm[Transpose[a]]
Protect[Transpose];

Then this will probably do what you want:

m = { {1, 2, 3}, {4, 5, 6} } // MatrixForm
m // Transpose

A more complete solution would do the same for other matrix functions.

Bobby

Harold.Noffke at wpafb.af.mil (Harold Noffke) wrote in message news:<bs1b8r$9m0$1 at smc.vnet.net>...
> If you type ...
> 
>     ?Transpose
> 
> You get ...
> 
>     "Transpose[list] transposes the first two levels in list. ... "
> 
> This tells you Transpose takes a List as an argument, rather than a
> MatrixForm.
> 
> I think this could be corrected by Wolfram with a little code tinking,
> because "transpose" is one of the well-defined operators in matrix
> theory, so the average user expects Transpose to work on a MatrixForm
> as well as on a List.
> 
> Harold
> 
> nma124 at hotmail.com (steve_H) wrote in message news:<bruqrt$t0p$1 at smc.vnet.net>...
> > hello
> > 
> > Mathematica 5.0
> > 
> > m = { {1, 2, 3}, {4, 5, 6} } // MatrixForm
> > Transpose[m]
> > 
> > this just does nothing. it simply prints back what I typed with
> > m in MatrixForm but does not actually do the transpose.
> > 
> > But when I do
> > 
> > m = { {1, 2, 3}, {4, 5, 6} }
> > Transpose[m]
> > 
> > 
> > it works.
> > 
> > It seems that the function Transpose does not like to accept a
> > list in 'MatrixForm' ?
> > 
> > I use a MatrixForm to see the matrix better. Does this mean one have
> > to removed the MatrixForm each time before calling Transpose?

• Follow-Ups:
  • Re: Re: Transpose matrix does not work when MatrixForm is used, why?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>