On 12/17/2007 9:34 AM, Ptit_Bleu wrote:

> Hi,

>

> I have a vector called nfichiers of 138 names of file whose extension is .P0

> or P1 ... to P8.

> The script is not the same when the extension is P0 or P(1 to 8).

>

> Examples of file names :

> [128] "Output0.P0"

> [129] "Output0.P1"

> [130] "Output0.P2"

> [131] "Output01102007.P0"

> [132] "Output01102007.P1"

> [133] "Output01102007.P2"

> [134] "Output01102007.P3"

> [135] "Output01102007.P4"

>

>

> To extract the names of file with .P0 extension I wrote :

> nfichiers[grep(".P0", nfichiers)]

> For the other extensions :

> nfichiers[grep(".P[^0]", nfichiers)]

>

> But for the last, I get a length of 138 that is the length of the initial

> vector although I have 130 files with .P0 extension.

One problem above is that "." is special in regular expressions. I'd

also suggest adding $ at the end, to force the match to the end of the

string. That is, code as

grep("\\.P0$", nfichiers)

and

grep("\\.P[^0]$", nfichiers)

I don't know what false matches you were seeing, but this should

eliminate some.

Duncan Murdoch

>

> So I tried "manually" with a small vector :

>> s

> [1] "aa.P0" "bb.P0" "cc.P1" "dd.P2"

>> s[grep(".P[^0]", s)]

> [1] "cc.P1" "dd.P2"

>

> It works !!!

>

> Has someone an idea to solve this small problem ?

> Thanks in advance,

> Ptit Bleu.

>

>

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