R help - Oct 2012 - Swap rows and columns in a matrix

Dear R users,

I want a help to write an algorithm for swapping rows and columns in a matrix

thanks in advance
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Does the builtin function 't' work for your needs?

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Haris Rhrlp
Sent: Tuesday, October 30, 2012 3:00 PM
To: R-help at r-project.org
Subject: [R] Swap rows and columns in a matrix

Dear R users,

I want a help to write an algorithm for swapping rows and columns in a
matrix

thanks in advance
	[[alternative HTML version deleted]]

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On 31/10/12 07:59, Haris Rhrlp wrote:
> Dear R users,
>
> I want a help to write an algorithm for swapping rows and columns in a
matrix
>
> thanks in advance
?t

     (???)

     cheers,

         Rolf Turner

Unless there is a good reason not to, you should keep discussions
on-list.

On 31/10/12 08:29, Haris Rhrlp wrote:
> thank you for your answer but i dont want the transpose of matrix. I 
> want to swap rows seperatly and columns the same
Then I am afraid that your question is all Greek to me. :-)

You will have to explain --- with a simple example or two --- exactly what
it is that you want to accomplish.

     cheers,

         Rolf Turner
>
> ------------------------------------------------------------------------
> *Áðï:* Rolf Turner <rolf.turner@xtra.co.nz>
> *Ðñïò:* Haris Rhrlp <haris_r_help@yahoo.com>
> *Êïéí.:* "R-help@r-project.org" <R-help@r-project.org>
> *ÓôÜëèçêå:* 9:17 ì.ì. Ôñßôç, 30 Ïêôùâñßïõ 2012
> *Èåìá:* Re: [R] Swap rows and columns in a matrix
>
> On 31/10/12 07:59, Haris Rhrlp wrote:
> > Dear R users,
> >
> > I want a help to write an algorithm for swapping rows and columns in 
> a matrix
> >
> > thanks in advance
>
> ?t
>
>     (???)
	[[alternative HTML version deleted]]

On Oct 30, 2012, at 11:59 AM, Haris Rhrlp wrote:
> Dear R users,
> 
> I want a help to write an algorithm for swapping rows and columns in a
matrix
> 
This will "shuffle" columns, although 'randomly permute' is
the more common word for this;operation:

set.seed(123)
mat[, sample(dim(mat)[2] ]

This will swap rows:

set.seed(123)
mat[ sample(dim(mat)[1],  ]

-- 
David Winsemius, MD
Alameda, CA, USA

Okay; I think I get it.  One (rather kludgy) way of accomplishing your goal
is as follows:  Let the two matrices which you want to check for being
"isomorphic" be A and B.  Do:

rA <- apply(A,1,paste,collapse=" ")
rB <- apply(B,1,paste,collapse=" ")
cA <- apply(A,2,paste,collapse=" ")
cB <- apply(B,2,paste,collapse=" ")
iso <- all(sort(rA) == sort(rB)) | all(sort(cA) == sort(cB))

Then "iso" will be TRUE if A and B are "isomorphic" and
FALSE otherwise.

As you can see, this works by converting the rows and columns of your
matrices to character strings.  This should be OK --- I think that the base
method duplicated.data.frame() works along similar lines --- but it does
seem kludgy to me.

Perhaps someone else will come up with a sexier idea.

     cheers,

         Rolf

On 31/10/12 19:57, Haris Rhrlp wrote:
> i want to check for isomorphish between matrices i will give you an 
> example to see what i want.
>
> 1 -1 -1     1  1  1
> 1  1  1                    1 -1 -1
> -1 -1 1      -1 -1 1
> -1 1 -1     -1 1 -1
> this 2 matrices are isomorphic beacause if i swap the first 2 rows the 
> matrices will be intetical
> next example
>
> 1 -1 -1         -1  1  -1
> 1  1  1                       1  1   1
> -1 -1 1           -1 -1  1
> -1 1 -1                  1 -1 -1
>
> this 2 matrices are isomorphic beacuse if i swap the first 2 columns 
> the matrices will be intetical
>
> i want to write an algorithm to check all the swaps of the rows and 
> all the swaps of the columns
>
> and then if the matrices are indetical then will be isomorphic
>
> *Áðï:* Rolf Turner <rolf.turner@xtra.co.nz>
> *Ðñïò:* Haris Rhrlp <haris_r_help@yahoo.com>
> *Êïéí.:* "R-help@r-project.org" <R-help@r-project.org>
> *ÓôÜëèçêå:* 10:53 ì.ì. Ôñßôç, 30 Ïêôùâñßïõ 2012
> *Èåìá:* Re: Ó÷åô: [R] Swap rows and columns in a matrix
>
>
> Unless there is a good reason not to, you should keep discussions
> on-list.
>
> On 31/10/12 08:29, Haris Rhrlp wrote:
>> thank you for your answer but i dont want the transpose of matrix. I 
>> want to swap rows seperatly and columns the same
>
> Then I am afraid that your question is all Greek to me. :-)
>
> You will have to explain --- with a simple example or two --- exactly what
> it is that you want to accomplish.
>
>     cheers,
>
>         Rolf Turner
>>
>>
------------------------------------------------------------------------
>> *Áðï:* Rolf Turner <rolf.turner@xtra.co.nz> 
>> <mailto:rolf.turner@xtra.co.nz>
>> *Ðñïò:* Haris Rhrlp <haris_r_help@yahoo.com> 
>> <mailto:haris_r_help@yahoo.com>
>> *Êïéí.:* "R-help@r-project.org"
<mailto:R-help@r-project.org>
>> <R-help@r-project.org> <mailto:R-help@r-project.org>
>> *ÓôÜëèçêå:* 9:17 ì.ì. Ôñßôç, 30 Ïêôùâñßïõ 2012
>> *Èåìá:* Re: [R] Swap rows and columns in a matrix
>>
>> On 31/10/12 07:59, Haris Rhrlp wrote:
>> > Dear R users,
>> >
>> > I want a help to write an algorithm for swapping rows and columns 
>> in a matrix
>> >
>> > thanks in advance
>>
>> ?t
>>
>>     (???)
>
>

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