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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