[R] Problem with the grep function

From: <aubert_at_inapg.fr>
Date: Thu 08 Jul 2004 - 17:20:44 EST


Let me present to you my problem :

I have a character vector x and I would like to obtain the indices of the elements of
this vector that yielded exactly a match.

For example, x=nom, pattern="b", I would to obtain 2 because "b" is on the second position.

First program :
nom <- c("a","b","ab")
grep("b",nom)
2 3

Then I try the option extended =FALSE (instead of TRUE by default) and I obtain '2 3' a second time.

Please can you help me : How can I obtain only 2 in using the grep function (without using the match function).

Thanks you

Julie AUBERT



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https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Jul 08 17:26:55 2004

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