Hi Joe,
Not sure about your expected result
blah<- paste0("x",1:5)
which(blah=="xyz")
#integer(0)
blah=="xyz"
#[1] FALSE FALSE FALSE FALSE FALSE
any(blah=="xyz")
#[1] FALSE
sum(blah=="xyz")
#[1] 0
sum(blah=="x1")
#[1] 1
A.K.
----- Original Message -----
From: Joseph Trubisz <jtrub...@me.com>
To: r-help@r-project.org
Cc:
Sent: Wednesday, May 22, 2013 2:08 PM
Subject: [R] How to test if something doesn't exist
Couldn't exactly explain the subject, so here's the example:
idx<-which(blah[,1]=="xyz")
idx
integer(0)
How do I test that idx has a valid value (namely, > 0)?
TiA,
Joe
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