[R] subset data frame by variable with missing value

[PIKAL Petr]

Hi

see ?is.na

x <-sample(c(1:3, NA), 20, replace=T) 

x
 [1]  2 NA  2  3  3  3  3  2  3 NA  3  2  1  2 NA  3  3  3  2  2
y<-rnorm(20)
y[is.na(x)]
[1]  0.1600417  1.3264063 -0.6175832

Regards
Petr


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of ramoss
> Sent: Friday, November 30, 2012 4:27 PM
> To: r-help at r-project.org
> Subject: [R] subset data frame by variable with missing value
> 
> Hello,
> 
> I have a variable in a data frame that contains NA values. I just want
> to subset so that I get the obs where that variable is missing.
> In SAS I would do:
> 
> data missing;
>   set test;
>   if myvalue=' ';
> run;
> 
> How can I perform this simple task in R?
> 
> Thanks in advance for your help.
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/subset-
> data-frame-by-variable-with-missing-value-tp4651439.html
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> 
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