Dear R users,
Given this data:
x <- seq(1,100,1)
dx <- as.POSIXct(x*900, origin="2007-06-01 00:00:00")
dfx <- data.frame(dx)
Now to play around for example:
subset(dfx, dx > as.POSIXct("2007-06-01 16:00:00"))
Ok. Now for some reason I want to extract the datapoints between hours
10:00:00 and 14:00:00, so I thought well:
subset(dfx, dx > as.POSIXct("2007-06-01 16:00:00"), 14 > as.POSIXlt(dx)$hour
& as.POSIXlt(dx)$hour < 10)
Error in as.POSIXlt.numeric(dx) : 'origin' must be supplied
Well that did not work. But why does the following work?
14 > as.POSIXlt(dx)$hour & as.POSIXlt(dx)$hour < 10
Is there something I miss about subset()? Or is there even another way of
aggregating over an hourly time interval in a nicer way?
Best Regards,
Michael Bach
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