Hello,
Em 16-07-2012 22:45, e-letter escreveu:
On 16/07/2012, r-help-requ...@r-project.org
<r-help-requ...@r-project.org> wrote:
> ------------------------------
>
> Message: 77
> Date: Mon, 16 Jul 2012 10:48:39 +0100
> From: Rui Barradas <ruipbarra...@sapo.pt>
> To: e-letter <inp...@gmail.com>
> Cc: r-help@r-project.org
> Subject: Re: [R] histogram of time-stamp data
> Message-ID: <5003e377.3000...@sapo.pt>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
> timestamps <- as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE)
>
Why is it necessary to apply the sample to the current date? Looking
at the dataframe, I noticed that values have been changed:
No! That instruction is just to create a data example with more
date/time values, in this case with a total of 1e3 different values.
What's important is the way to plot the histogram, namely, the cut()
with two example time periods, and that hist() needs numbers, not cut's
levels.
Rui Barradas
file 'test.txt':
12:19:00
09:30:00
16:56:00
01:56:00
10:44:00
10:31:00
02:14:00
05:05:00
12:52:00
21:50:00
R command terminal input:
> timestamps<-read.table("test.txt")
> timestamps
V1
1 12:19:00
2 09:30:00
3 16:56:00
4 01:56:00
5 10:44:00
6 10:31:00
7 02:14:00
8 05:05:00
9 12:52:00
10 21:50:00
> timestamps <- as.POSIXct(Sys.Date()) + sample(24*60*60, 1e3, TRUE)
> write.csv(timestamps,file="test1.txt")
test1.txt:
"","x"
"1",2012-07-16 04:52:48
"2",2012-07-16 21:21:28
"3",2012-07-16 18:58:27
"4",2012-07-16 22:17:25
"5",2012-07-16 11:13:52
"6",2012-07-16 03:17:35
"7",2012-07-16 02:14:17
"8",2012-07-16 14:18:27
"9",2012-07-16 14:39:16
Why is this happening?
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