[R] value matching %in% for a number pair

[Jeff Newmiller]

Sorry, that was a fail. Better to think about:

any( 2 == p[,1] & 3 == p[,2] )
v <- matrix( c( 2,3, 1,2, 5,5 ), byrow=TRUE, ncol=2 )
apply( v, 1, function(x) { any( x[1]==p[,1] & x[2]==p[,2] ) } )

-- 
Sent from my phone. Please excuse my brevity.

On November 12, 2016 6:11:13 PM PST, Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
>This really depends on the way you represent these pairs. Here is some
>food for thought:
>
>p <- matrix( c( 1,2, 4,3, 3,3, 2,3, 4,5 ), byrow=TRUE, ncol=2 )
>( 2 %in% p[,1] ) & ( 3 %in% p[,2] ) # (2,3)
>( c( 2, 1, 5 ) %in% p[,1] ) & ( c( 3, 2, 5 ) %in% p[,2] ) # (2,3) (1,2)
>(5,5)
>
>-- 
>Sent from my phone. Please excuse my brevity.
>
>On November 12, 2016 5:36:37 PM PST, John <miaojpm at gmail.com> wrote:
>>Hi,
>>
>>   We can match one numerical value as follows
>>> 3 %in% c(4,5)
>>[1] FALSE
>>> 3 %in% c(4,5,3)
>>[1] TRUE
>>
>>   To see whether value pairs are identical,
>>> identical(c(3,4), c(3,5))
>>[1] FALSE
>>> identical(c(3,4), c(3,4))
>>[1] TRUE
>>
>>   Is there any way to test whether “A value pair is in a set of value
>>pairs”? For example, can we test whether the pair (2,3) is identical
>to
>>one
>>of the pairs in the set S={(1,2), (4,3), (3,3), (2,3), (4,5)}?
>> In this case, the answer is yes because the 4th element of S is
>(2,3).
>>Is there any simple way to code it? Thanks!
>>
>>John
>>
>>	[[alternative HTML version deleted]]
>>
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>
>______________________________________________
>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.