Try this:
1) Rows:
merge(as.data.frame(a), as.data.frame(b), sort = FALSE)
2) Index:
merge(cbind(as.data.frame(a), Idx = 1:nrow(a)), as.data.frame(b), sort =
FALSE)$Idx
On Tue, Dec 9, 2008 at 12:57 PM, ppaarrkk <[EMAIL PROTECTED]> wrote:
>
> I want to compare two matrices or data frames and s
Thanks for reply.
What I want is the equivalent of this :
xxx = 1:10
which(xxx %in% c(2,5))
...but where there is more than one criterion for matching.
which (b %in% a) in the code I included does nothing (not surprisingly).
I'm not sure that I can use merge, because I want the whole of
Dear Simon,
Try this:
# Index -- FALSE, TRUE
sapply(1:nrow(a),function(x) all(a[x,]%in%b))
# Rows of a that are in b
which(sapply(1:nrow(a),function(x) all(a[x,]%in%b)))
# Reporting
a[sapply(1:nrow(a),function(x) all(a[x,]%in%b)),]
HTH,
Jorge
On Tue, Dec 9, 2008 at 9:57 AM, ppaarrkk <[EMA
I'm not sure what you want, but take a look at ?merge and %in%
ppaarrkk wrote:
>
> I want to compare two matrices or data frames and select or get an index
> for those rows which are the same in both. I have tried the following :
>
>
>
>
>
>
> a = matrix ( 1:10, ncol = 2 )
> a
>
> b = ma
I want to compare two matrices or data frames and select or get an index for
those rows which are the same in both. I have tried the following :
a = matrix ( 1:10, ncol = 2 )
a
b = matrix ( c ( 2,3,4,7,8,9 ), ncol = 2 )
b
a[a==b]
a = as.data.frame ( matrix ( 1:10, ncol = 2 ) )
a
b =
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