Hi Enrico, yes it works. I can also plot the graph.
Next question, how do I delete the date from 16 December until 31 December
2014?
Thank you very much.
> dt$time <- as.POSIXct(dt$time)> > dt_ts <- xts(dt$count, dt$time)>
> str(dt_ts)An xts object on 2014-01-01 / 2014-12-31 23:59:00 containing:
Data: integer [525600, 1]
Index: POSIXct,POSIXt [525600] (TZ: "")
plot(dt_ts)
On Wed, Oct 2, 2024 at 3:01 PM Enrico Schumann <e...@enricoschumann.net>
wrote:
> On Wed, 02 Oct 2024, roslinazairimah zakaria writes:
>
> > Dear all, I have a data in data frame and would like to change to time
> > series data. Thank you for any help given.
> >
> >> str(dt)'data.frame': 525600 obs. of 3 variables:
> > $ time : chr "2014-01-01 00:00:00" "2014-01-01 00:01:00"
> > "2014-01-01 00:02:00" "2014-01-01 00:03:00" ...
> > $ cnt_charge_events: int 0 0 0 0 0 0 0 0 0 0 ...
> > $ count : int 0 0 0 0 0 0 0 0 0 0 ...
> >
> >> head(dt) time cnt_charge_events count
> > 1 2014-01-01 00:00:00 0 0
> > 2 2014-01-01 00:01:00 0 0
> > 3 2014-01-01 00:02:00 0 0
> > 4 2014-01-01 00:03:00 0 0
> > 5 2014-01-01 00:04:00 0 0
> > 6 2014-01-01 00:05:00 0 0
> >
> >
> >> dt_ts <- xts(dt$count, dt$time)Error in xts(dt$count, dt$time) :
> > order.by requires an appropriate time-based object> head(dt_ts)Time
> Series:
> > Start = 1
> > End = 6
> > Frequency = 1
> > dt_ts.date dt_ts.time dt[, 3]
> > 1 16071 1 0
> > 2 16071 2 0
> > 3 16071 3 0
> > 4 16071 4 0
> > 5 16071 5 0
> > 6 16071 6 0Dear
>
>
> Your "time" column consists of character strings, not
> actual timestamps.
>
> dt <- read.table(
> text ="
> time, cnt_charge_events, count
> 2014-01-01 00:00:00, 1, 1
> 2014-01-01 00:01:00, 2, 2
> 2014-01-01 00:02:00, 3, 3
> 2014-01-01 00:03:00, 4, 4
> 2014-01-01 00:04:00, 5, 5
> 2014-01-01 00:05:00, 6, 6",
> header = TRUE, sep = ",")
>
> library("xts")
> xts(dt$count, dt$time) ## won't work
> ## Error in xts(dt$count, dt$time) :
> ## order.by requires an appropriate time-based object
>
> dt$time <- as.POSIXct(dt$time)
> xts(dt$count, dt$time)
> ## [,1]
> ## 2014-01-01 00:00:00 1
> ## 2014-01-01 00:01:00 2
> ## 2014-01-01 00:02:00 3
>
> But be sure to read about ?as.POSIXct; in particular,
> the handling of timezones/daylight-saving time.
>
>
> > [[alternative HTML version deleted]]
>
> Please send plain-text messages to this list; otherwise,
> the results become hard to read.
>
> --
> Enrico Schumann
> Lucerne, Switzerland
> https://enricoschumann.net
>
--
*Roslinazairimah Zakaria*
*Tel: +609-5492370; Fax. No.+609-5492766*
*Email: roslinazairi...@ump.edu.my <roslinazairi...@ump.edu.my>;
roslina...@gmail.com <roslina...@gmail.com>*
Faculty of Industrial Sciences & Technology
University Malaysia Pahang
Lebuhraya Tun Razak, 26300 Gambang, Pahang, Malaysia
[[alternative HTML version deleted]]
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