From rsingle@zoo.uvm.edu  Tue Aug 27 01:21:29 2002
From: rsingle@zoo.uvm.edu (rsingle@zoo.uvm.edu)
Date: Tue, 27 Aug 2002 02:21:29 +0200 (MET DST)
Subject: strange result from x[x!="NA"] (PR#1952)
Message-ID: <200208270021.CAA09251@pubhealth.ku.dk>

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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strange result from x[x!="NA"] (PR#1952)
rsingle@zoo.uvm.edu