[R] histogram of time-stamp data

[Rui Barradas]

Hello,

Try the following.


timestamps <- as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE)

h1 <- cut(timestamps, breaks="hour")
h2 <- cut(timestamps, breaks="15 mins")

op <- par(mfrow=c(1, 2))
hist(as.integer(h1))
hist(as.integer(h2))
par(op)


Hope this helps,

Rui Barradas

Em 16-07-2012 09:47, e-letter escreveu:
> Readers,
>
> A data set consists of time-stamp values:
>
> 00:00:00
> 23:11:00
> 06:22:00
>
> The data set was imported:
>
> timestamps<-read.table("path/to/timestampsvalues")
> hist(timestamps)
>
> ...error... x must be numeric
>
> Then tried:
>
> plot(timestamps).
>
> How to adjust the graph to create a histogram where the intervals
> ranges can be specified, e.g. intervals of 60 minutes?
>
> Thanks in advance.
>
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> and provide commented, minimal, self-contained, reproducible code.
>