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

• To: mathgroup at smc.vnet.net
• Subject: [mg45247] Re: [mg45221] Re: Transpose matrix does not work when MatrixForm is used, why?
• From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
• Date: Tue, 23 Dec 2003 05:13:38 -0500 (EST)
• References: <bruqrt$t0p$1@smc.vnet.net> <bs1b8r$9m0$1@smc.vnet.net> <200312210842.DAA18953@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

This of course works, but presumably he would want do this for other 
functions, (e.g. Inverse etc), not just transpose. So it seems to me it 
is easier simply to use Map:

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

etc.

Andrzej Kozlowski

On 21 Dec 2003, at 17:42, Bobby R. Treat wrote:

> 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?
>
>

• References:
  • Re: Transpose matrix does not work when MatrixForm is used, why?
    • From: drbob@bigfoot.com (Bobby R. Treat)