R help - Jun 2012 - Compare two matrices in r

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]]

See the example at

http://onertipaday.blogspot.com/2007/05/comparing-two-matrices-row-by-row.html

Ozgur

--
View this message in context:
http://r.789695.n4.nabble.com/Compare-two-matrices-in-r-tp4633082p4633087.html
Sent from the R help mailing list archive at Nabble.com.

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]]
>
> ______________________________________________
> R-help at r-project.org 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.
>