[R] comparing matrices
David Winsemius
dwinsemius at comcast.net
Sun Apr 26 19:31:21 CEST 2009
On Apr 26, 2009, at 1:02 PM, Esmail wrote:
> I'm trying to compare two matrices made up of bits.
>
> doing a simple comparison of
>
> matA == matB
> identical( matrix((1:4), ncol=2), matrix((1:4), nrow=2))
[1] TRUE
> identical( matrix((1:4), ncol=2), matrix((2:5), nrow=2))
[1] FALSE
>
>
> yields this sort of output.
>
> [,1] [,2] [,3] [,4] [,5] [,6]
> [1,] FALSE TRUE FALSE TRUE TRUE FALSE
> [2,] TRUE TRUE TRUE TRUE TRUE TRUE
> [3,] FALSE TRUE FALSE FALSE FALSE TRUE
> [4,] FALSE TRUE TRUE FALSE FALSE FALSE
> [5,] TRUE TRUE TRUE TRUE FALSE FALSE
> [6,] TRUE TRUE TRUE TRUE FALSE FALSE
>
> I really would like just one comprehensive value to say TRUE or FALSE.
>
> This is the hack (rather ugly I think) I put together that works,
> but there has to be a nicer way, no?
>
> res=pop[1:ROWS,] == keep[1:ROWS,]
>
>
> if ((ROWS*COL) == sum(res))
> {
> cat('they are equal\n')
> }else
> cat('they are NOT equal\n')
That code is meaningless to us without a definition (in R) of ROWS,
COL, keep, and pop
>
>
> Thanks!
>
> Esmail
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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