On 01/23/2014 04:49 PM, Hervé Pagès wrote:
Hi Mintewab,
With the IRanges packages (from Bioconductor):
> library(IRanges)
> countMatches(z, w)
[1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 0 3 1 1 0 1 0 0 0 0 0 0 1 3
2 0 0 1 0 0
[39] 0 0 0 0 0 0 0 0
And if you don't want to depend on IRanges for such a simple operation,
here how countMatches() is implemented:
countMatches <- function(x, table)
{
table2 <- match(table, x)
x2 <- match(x, x)
tabulate(table2, nbins=length(x))[x2]
}
Cheers,
H.
To install the IRanges package:
source("http://bioconductor.org/biocLite.R";)
biocLite("IRanges")
Cheers,
H.
On 01/23/2014 07:43 AM, m.beza...@lse.ac.uk wrote:
Hi all,
I have the following reproducible example
z<-c(-5:40)
w<-c(11, 11, 12, 14, 14, 14, 15, 16, 18, 25, 26, 26, 26, 27, 27, 30)
r<-z %in% w
now r gives me the presence or absence of elements in z that are in w
but I am interested in getting the number of times each element in z
appears (or doesn't appear) in w. I want the dimension of my
resulting vector to be the same as that of z. How do I do that?
Thanks in advance
Mintewab
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--
Hervé Pagès
Program in Computational Biology
Division of Public Health Sciences
Fred Hutchinson Cancer Research Center
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