[R] Find the empty element in a factor array

Peter Alspach Peter.Alspach at plantandfood.co.nz
Thu Jan 27 02:00:16 CET 2011

Tena koe Wendy


Should do it.

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Wendy
> Sent: Thursday, 27 January 2011 10:59 a.m.
> To: r-help at r-project.org
> Subject: [R] Find the empty element in a factor array
> 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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> empty-element-in-a-factor-array-tp3238894p3238894.html
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> and provide commented, minimal, self-contained, reproducible code.

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