[R] histogram of time-stamp data
e-letter
inpost at gmail.com
Tue Jul 17 08:11:37 CEST 2012
On 16/07/2012, Rui Barradas <ruipbarradas at sapo.pt> wrote:
> Hello,
>
> Em 16-07-2012 22:45, e-letter escreveu:
>> On 16/07/2012, r-help-request at r-project.org
>> <r-help-request at r-project.org> wrote:
>> > ------------------------------
>> >
>> > Message: 77
>> > Date: Mon, 16 Jul 2012 10:48:39 +0100
>> > From: Rui Barradas <ruipbarradas at sapo.pt>
>> > To: e-letter <inpost at gmail.com>
>> > Cc: r-help at r-project.org
>> > Subject: Re: [R] histogram of time-stamp data
>> > Message-ID: <5003E377.3000604 at 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.
>
With the original data provided, R reports an error, that "'x' must be numeric'.
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