[R] grep negation

Thu Jun 23 15:04:14 CEST 2005

?setdiff

e.g.,

> txt <- c("arm","foot","lefroo", "bafoobar")
> i <- grep("foo",txt); i
[1] 2 4
> setdiff(seq(length(txt)),grep("foo",txt))
[1] 1 3
>

Jim
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James Holtman        "What is the problem you are trying to solve?"
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                      Marcus Leinweber                                                                                                     
                      <leinwebe at eva.mpg.de>        To:       "'r-help at stat.math.ethz.ch'" <r-help at stat.math.ethz.ch>                       
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                      r-help-bounces at stat.m        Subject:  [R] grep negation                                                             
                      ath.ethz.ch                                                                                                          

                      06/23/2005 08:59                                                                                                     

hi,

using the example in the grep help:
txt <- c("arm","foot","lefroo", "bafoobar")
i <- grep("foo",txt); i
[1] 2 4

but how can i get the negation (1,3) when looking for 'foo'?

thanks,
m.

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