[R] matching elements from two vectors
maechler at stat.math.ethz.ch
Fri Aug 17 19:12:44 CEST 2007
>>>>> "GF" == GonÃ§alo Ferraz <gferraz29 at gmail.com>
>>>>> on Fri, 17 Aug 2007 11:03:09 -0400 writes:
GF> Thanks much. x %in% y works.
But I wonder a bit why nobody remarked on the facts that
1) you use "match" in the subject of your e-mail
2) match() is the basic ingredient you use:
'%in%' is trivially defined via match().
Type `%in%` in your R session.
GF> On 8/17/07, jim holtman <jholtman at gmail.com> wrote:
>> Also if you want all the matches
>> > x[x %in% y]
>>  2 3 3 3
>> On 8/17/07, Gonçalo Ferraz <gferraz29 at gmail.com> wrote:
>> > Hi,
>> > Imagine a vector x with elements (1,2,1,1,3,5,3,3,1) and a vector y with
>> > elements (2,3). I need to find out what elements of x match any of the
>> > elements of y.
>> > Is there a simple command that will return a vector with elements
>> > (F,T,F,F,T,F,T,T,F). Ideally, I would like a solution that works with
>> > dataframe colums as well.
>> > I have tried x==y and it doesn't work.
>> > x==any(y) doesn't work either. I realize I could write a foor loop and
>> > through each element of y asking if it matches any element of x, but
>> > there a shorter way?
>> > Thanks,
>> > Gonçalo
>> > [[alternative HTML version deleted]]
>> > ______________________________________________
>> > R-help at stat.math.ethz.ch mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide
>> > and provide commented, minimal, self-contained, reproducible code.
>> Jim Holtman
>> Cincinnati, OH
>> +1 513 646 9390
>> What is the problem you are trying to solve?
GF> [[alternative HTML version deleted]]
GF> R-help at stat.math.ethz.ch mailing list
GF> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
GF> and provide commented, minimal, self-contained, reproducible code.
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