[R] subset data frame by variable with missing value

[Milan Bouchet-Valat]

Le vendredi 30 novembre 2012 à 07:27 -0800, ramoss a écrit :
> 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?
missing <- test[is.na(test$myvalue),]
or
missing <- subset(test, is.na(myvalue))


Regards

> Thanks in advance for your help. 
> 
> 
> 
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