Re: [R] regexpr mystery can not remove trailing spaces

From: Petr PIKAL <petr.pikal_at_precheza.cz>
Date: Wed, 02 Jun 2010 15:54:46 +0200

Hi

thanks. I am puzzled what was wrong. Now even

sub(' +$', '', bbb[1])

works. I am checking water throughput in nearby river and copying data from internet. So I wonder if there was some change recently as during floods they update it in about 10 minutes interval.

Regards
Petr

jim holtman <jholtman_at_gmail.com> napsal dne 02.06.2010 15:44:42:

> You had the wrong case on 'w' and the wrong expression with
> [:space:]'; see below
>
> > bbb <- c("02.06.10 12:40 ", "02.06.10 12:00 ", "02.06.10 11:00 ",
> + "02.06.10 10:00 ", "02.06.10 09:00 ", "02.06.10 08:00 ",
> + "02.06.10 07:00 ", "02.06.10 06:00 ", "02.06.10 05:00 ",
> + "02.06.10 04:00 ", "02.06.10 03:00 ", "02.06.10 02:00 ",
> + "02.06.10 01:00 ", "02.06.10 00:00 ", "01.06.10 23:00 ",
> + "01.06.10 22:00 ", "01.06.10 21:00 ", "01.06.10 20:00 ",
> + "01.06.10 19:00 ", "01.06.10 18:00 ", "01.06.10 17:00 ",
> + "01.06.10 16:00 ", "01.06.10 15:00 ", "01.06.10 14:00 ",
> + "01.06.10 13:00 ", "01.06.10 05:00 ", "31.05.10 05:00 ",
> + "30.05.10 05:00 ", "29.05.10 05:00 ", "28.05.10 05:00 ",
> + "27.05.10 05:00 ")
> > sub('\\W+$', '', bbb[1])
> [1] "02.06.10 12:40"
> > sub('[[:space:]]+$', '', bbb[1])
> [1] "02.06.10 12:40"
> >
>
>
> On Wed, Jun 2, 2010 at 9:22 AM, Petr PIKAL <petr.pikal_at_precheza.cz>
wrote:
> > Hi
> >
> >> dput(bbb)
> > c("02.06.10 12:40 ", "02.06.10 12:00 ", "02.06.10 11:00 ",
> > "02.06.10 10:00 ", "02.06.10 09:00 ", "02.06.10 08:00 ",
> > "02.06.10 07:00 ", "02.06.10 06:00 ", "02.06.10 05:00 ",
> > "02.06.10 04:00 ", "02.06.10 03:00 ", "02.06.10 02:00 ",
> > "02.06.10 01:00 ", "02.06.10 00:00 ", "01.06.10 23:00 ",
> > "01.06.10 22:00 ", "01.06.10 21:00 ", "01.06.10 20:00 ",
> > "01.06.10 19:00 ", "01.06.10 18:00 ", "01.06.10 17:00 ",
> > "01.06.10 16:00 ", "01.06.10 15:00 ", "01.06.10 14:00 ",
> > "01.06.10 13:00 ", "01.06.10 05:00 ", "31.05.10 05:00 ",
> > "30.05.10 05:00 ", "29.05.10 05:00 ", "28.05.10 05:00 ",
> > "27.05.10 05:00 ")
> >>
> >
> > For simplicity I change the name and put it to single variable.
> > I also reinstalled R to recent R-devel
> >
> >> sub('\\w+$', '', bbb[1])
> > [1] "02.06.10 12:40 "
> >> sub('[:space:]', '', bbb[1])
> > [1] "02.06.10 1240 "
> >>
> >
> > I also tried Matt's suggestion but it did not help.
> >
> > Regards
> > Petr
> >
> > Joris Meys <jorismeys_at_gmail.com> napsal dne 02.06.2010 14:35:19:
> >
> >> Could you provide us with dput(becva$V1[1])?
> >> Cheers
> >> Joris
> >
> >> On Wed, Jun 2, 2010 at 2:07 PM, Petr PIKAL <petr.pikal_at_precheza.cz>
> > wrote:
> >> Dear all
> >>
> >> I encountered strange problem with regexpr replacement
> >>
> >> I made this character object
> >>
> >> str <- "02.06.10 12:40 "
> >>
> >> > str(str)
> >> chr "02.06.10 12:40 "
> >>
> >> I read in an object which seems to be quite similar
> >>
> >> > str(as.character(becva$V1)[1])
> >> chr "02.06.10 12:40 "
> >>
> >> However I can not remove trailing spaces from it
> >>
> >> > sub(' +$', '', as.character(becva$V1[1]))
> >>
> >> [1] "02.06.10 12:40 "
> >> > sub(' +$', '', str)
> >> [1] "02.06.10 12:40"
> >> >
> >>
> >> Do somebody have an idea what to do?
> >>
> >> $version.string
> >> [1] "R version 2.12.0 Under development (unstable) (2010-04-25
r51820)"
> >>
> >> on Windows
> >>
> >> Regards
> >> Petr
> >>
> >> ______________________________________________
> >> R-help_at_r-project.org mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> >> PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >>
> >>
> >> --
> >> Joris Meys
> >> Statistical Consultant
> >>
> >> Ghent University
> >> Faculty of Bioscience Engineering
> >> Department of Applied mathematics, biometrics and process control
> >>
> >> Coupure Links 653
> >> B-9000 Gent
> >>
> >> tel : +32 9 264 59 87
> >> Joris.Meys_at_Ugent.be
> >> -------------------------------
> >> Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php
> >
> > ______________________________________________
> > R-help_at_r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?



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