Thanks It really helped On Tue, Jun 12, 2012 at 5:22 PM, Rui Barradas <[email protected]> wrote:
> Hello, > > There are several notions of "equal". Note that all(mat1 == mat2) alone > doesn't allways do it, it only works if the matrices have equal dimensions. > If they don't, it breaks the code. That's the case of the first example > below. > Try the following. > > > a <- matrix(1:16, ncol=2) > b <- matrix(1:16, ncol=4, dimnames=list(1:4, letters[1:4])) > d <- matrix(1:16, ncol=4) > > a == b # Error in a == b : non-conformable arrays > identical(a, b) # FALSE > all.equal(a, b) # why? different dims and different dimnames > > all(d == b) # TRUE but > identical(d, b) # FALSE > all.equal(d, b) # why? different dimnames > > # An one line way of solving it. > matequal <- function(x, y) > is.matrix(x) && is.matrix(y) && dim(x) == dim(y) && all(x == y) > > matequal(a, b) # FALSE > matequal(d, b) # TRUE > > > Hope this helps, > > Rui Barradas > > Em 12-06-2012 08:52, HIMANSHU MITTAL escreveu: > >> Dear all, >> I want to compare two matrices . the code must return True only when all >> the elements of the two matices match. >> >> How can this be done in R ? >> >> Regards >> >> [[alternative HTML version deleted]] >> >> >> ______________________________**________________ >> [email protected] mailing list >> https://stat.ethz.ch/mailman/**listinfo/r-help<https://stat.ethz.ch/mailman/listinfo/r-help> >> PLEASE do read the posting guide http://www.R-project.org/** >> posting-guide.html <http://www.R-project.org/posting-guide.html> >> and provide commented, minimal, self-contained, reproducible code. >> >> > [[alternative HTML version deleted]] ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
