Re: [R] subset POSIXct

If you want to use regular expressions, try: > x V1 V2 V3 V4 1 1 2009-06-20 00:53:00 73 2 2 2009-06-20 01:08:00 73 3 3 2009-06-20 01:44:00 72 4 4 2009-06-20 01:53:00 71 5 5 2009-06-20 02:07:00 72 > x[grep(":53:", x$V3),] V1 V2 V3 V4 1 1 2009-06-20 00:53:00 73 4

Re: [R] subset POSIXct

Try this: > Lines <- "dt,tf + 2009-06-20 00:53:00,73 + 2009-06-20 01:08:00,73 + 2009-06-20 01:44:00,72 + 2009-06-20 01:53:00,71 + 2009-06-20 02:07:00,72" > DF <- read.csv(textConnection(Lines), colClasses = c("POSIXct", "numeric")) > DF[format(DF$dt, "%M") == "53",] dt tf 1 2009

Re: [R] subset POSIXct

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 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. > >

[R] subset POSIXct

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