help : matrix row/column random mixing

"booop" == booop booop <booopi at yahoo.com>
    on Wed, 2 Nov 2005 13:22:55 -0800 (PST) writes:

booop> Could anybody help me in mixing the matrix values
    booop> randomly (first rows and then columns)...  for eg
    booop> putting the 1 st row in the place of 3 rd and 3rd in
    booop> place of 4 th and 4th in place of 1st row
    booop> ...something like this in columns also..
 
    booop> Please suggest me some ways..
 
    booop> thanks a lot..
 
    booop> with regards, boopathy.

Quite a few of us don't like such completely anonymous postings.
At least tell us a "who you are" in your signature....

... and 
		
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           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Indeed, please do read it!

There are several bootstrap packages available at CRAN that probably 
provide an elegant solution, but simply permuting the matrix is pretty easy

 > data <- matrix(1:100,nrow=5) # matrix of 5 rows and 20 columns
 > x <- data[sample(1:5),] # permute the rows
 > y <- x[,sample(1:20)] # permute the columns

to really scamble the matrix

 > z <- matrix(sample(data),nrow=5)

Dave R.

Could anybody help me in mixing the matrix values randomly (first rows and then columns)...
 
for eg  putting the 1 st row in the place of 3 rd and 3rd in place of 4 th and 4th in place of 1st row ...something like this in columns also..
 
Please suggest me some ways..
 
thanks a lot..
 
with regards,
boopathy.

		
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