Hi Julie,
match is not exactly what you need, as it works with regular expressions
and takes anything what includes a letter "b".
For your case, there is perfectly suitable
which(nom=="b")
nom <- c("a","b","ab", "b")
which(nom=="b")
[1] 2 4
Jan
- - - Original message: - - -
From: [EMAIL PROTECTED]
Send: 8.7.2004 9:24:58
To: [EMAIL PROTECTED]
Subject: [R] Problem with the grep function
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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