Thanks
It really helped

On Tue, Jun 12, 2012 at 5:22 PM, Rui Barradas <ruipbarradas@sapo.pt> 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]]
>>
>>
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>>
>>
>

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