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. --------------------------------- [[alternative HTML version deleted]]
>>>>> "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 booop> --------------------------------- booop> [[alternative HTML version deleted]] booop> ______________________________________________ booop> R-help at stat.math.ethz.ch mailing list booop> https://stat.ethz.ch/mailman/listinfo/r-help booop> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 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. booop booop wrote:> 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. > > > --------------------------------- > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > >-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ David W. Roberts office 406-994-4548 Professor and Head FAX 406-994-3190 Department of Ecology email droberts at montana.edu Montana State University Bozeman, MT 59717-3460