[R] Find the empty element in a factor array
Wendy
wendy2.qiao at gmail.com
Wed Jan 26 22:58:31 CET 2011
Hi all,
I have a factor array, and some of the elements are empty. How would I
return the index number of the empty elements. For example,
test<-factor(c('A','','B','C','E'))
> test
[1] A B C E
Levels: A B C E
I would like the result equal to 2.
Thank you,
Wendy
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