From ripley@stats.ox.ac.uk  Tue Aug 27 07:51:56 2002
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Tue, 27 Aug 2002 07:51:56 +0100 (BST)
Subject: strange result from x[x!="NA"] (PR#1952)
In-Reply-To: <200208270021.CAA09251@pubhealth.ku.dk>
Message-ID: <Pine.LNX.4.31.0208270749550.31357-100000@gannet.stats>

This is correct: see the NEWS file.

Working as documented is not a bug.

On Tue, 27 Aug 2002 rsingle@zoo.uvm.edu wrote:

> Full_Name: Richard Single
> Version: 1.5.1
> OS: Windows
> Submission from: (NULL) (132.198.176.82)
>
>
> In the latest Windows version the following syntax behaves
> differently than it did in version 1.4.0: x[x!="NA"]
> The results under R 1.4.0 agree with S.
>
> --Rich
>
> R 1.4.0
> > x <- c(NA, 2, 3, NA)
> > x == "NA"
>  [1]  TRUE FALSE FALSE  TRUE
> > is.na(x)
>  [1]  TRUE FALSE FALSE  TRUE
>
>
> R 1.5.1
> > x <- c(NA, 2, 3, NA)
> > x == "NA"
>  [1]    NA FALSE FALSE    NA
> > is.na(x)
>  [1]  TRUE FALSE FALSE  TRUE
>
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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strange result from x[x!="NA"] (PR#1952)
ripley@stats.ox.ac.uk