[R] How to test if something doesn't exist
arun
smartpink111 at yahoo.com
Wed May 22 20:29:59 CEST 2013
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 <jtrubisz at me.com>
To: r-help at 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
______________________________________________
R-help at r-project.org mailing list
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.
More information about the R-help
mailing list