Convert dt to POSIXct class:
wtd$dt <- as.POSIXct(wtd$dt) subset(wtd, format(dt, '%M') == 53) On Mon, Jun 22, 2009 at 9:58 PM, Keith Jones <keit...@keithljelp.com> wrote: > Hi, > > I have a data frame with two columns: dt and tf. The dt column is datetime > and the tf column is a temperature. > > dt tf > 1 2009-06-20 00:53:00 73 > 2 2009-06-20 01:08:00 73 > 3 2009-06-20 01:44:00 72 > 4 2009-06-20 01:53:00 71 > 5 2009-06-20 02:07:00 72 > ... > > I need a subset of the rows where the minutes are 53. The hour is > immaterial. I can not find a wildcard character to use to select the rows. > > as.character(wtd$dt) %in% "2009-06-21 ??:53:00" or as.character(wtd$dt) > %in% "2009-06-21 **:53:00" does not work. > > What would you recommend? > > Thanks, > > Keith Jones, Ph.D. > VTS Pumps > > ______________________________________________ > R-help@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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ R-help@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.
