[R] Why can't R understand if(num!=NA)?
arun
smartpink111 at yahoo.com
Fri May 3 18:44:27 CEST 2013
num1<- c(0,NA,1,3)
num1==NA
#[1] NA NA NA NA
num1!=NA
#[1] NA NA NA NA
is.na(num1)
#[1] FALSE TRUE FALSE FALSE
A.K.
----- Original Message -----
From: jpm miao <miaojpm at gmail.com>
To: r-help <r-help at r-project.org>
Cc:
Sent: Friday, May 3, 2013 11:24 AM
Subject: [R] Why can't R understand if(num!=NA)?
I have a program, when I write
if(num!=NA)
it yields an error message.
However, if I write
if(is.na(num)==FALSE)
it works.
Why doesn't the first statement work?
Thanks,
Miao
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