Hello,
I have a matrix and I want to sample 20 rows that are the the percentiles of
0-100 in 0.05 increments.  I have a vector of my sequence

(0, 0.05, 0.10, 0.15,....1.0) and also

a normalised vector of rownumbers.  That is, there are 234 rows (for
example) so I do

perc<-c(1:234/234)

which looks like a bunch of numbers from 0 - 1.

In Excel (which I try not to use at every possible occaison) you can use a
VLOOKUP function to say choose the rows from the perc vector that are the
closest match to the sequence vector - i.e. you can specify to choose the
"closest" match, it doesn't have to be an exact match.

In R, I'd normally use the grep command when I know it's an exact match.
 Does anyone know how to achieve this in R?

Also, I've been getting heaps of help from everyone on this mailing list -
if I reply to the respondent and R Help again, will it show up in the
correct thread?  I haven't been able to say thankyou as I wasn't sure it
would show up in the thread.

Thanks


-- 
Gareth Campbell
PhD Candidate
The University of Auckland

P +649 815 3670
M +6421 256 3511
E gareth.campbell@esr.cri.nz
gcam032@gmail.com

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