Message-ID: <594874FF-C865-453F-A55D-80D1F6972E84@xs4all.nl>
Date: 2013-05-03T16:30:07Z
From: Berend Hasselman
Subject: Why can't R understand if(num!=NA)?
In-Reply-To: <CABcx46DOkqo+2njKqaFyaxBN7YRBj7YKn_r3TkQw1JUi9m4Tfg@mail.gmail.com>
On 03-05-2013, at 17:24, jpm miao <miaojpm at gmail.com> wrote:
> I have a program, when I write
>
> if(num!=NA)
>
> it yields an error message.
>
it?
What is unclear about the error message?
> However, if I write
>
> if(is.na(num)==FALSE)
>
> it works.
>
> Why doesn't the first statement work?
>
Read section 2.5 'Missing values" of the manual "An Introduction to R".
Berend
> Thanks,
>
> Miao
>
> [[alternative HTML version deleted]]
>
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