Message-ID: <1367599467.86935.YahooMailNeo@web142602.mail.bf1.yahoo.com>
Date: 2013-05-03T16:44:27Z
From: arun
Subject: Why can't R understand if(num!=NA)?
In-Reply-To: <CABcx46DOkqo+2njKqaFyaxBN7YRBj7YKn_r3TkQw1JUi9m4Tfg@mail.gmail.com>
?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
??? [[alternative HTML version deleted]]
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