subset data frame by variable with missing value

Le vendredi 30 novembre 2012 ? 07:27 -0800, ramoss a ?crit :
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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subset data frame by variable with missing value

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