[R] Problem with the grep function

[Alec Stephenson]

grep("^b$",nom) will match "b" only.

Alec


Alec Stephenson                                               
Department of Statistics
Macquarie University
NSW 2109, Australia 

>>> "aubert at inapg.fr" <aubert at inapg.fr> 07/08/04 05:20pm >>>
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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