Re: [R] histogram() with "Date" class?

From: Ola Caster <ola.caster_at_gmail.com>
Date: Fri, 09 May 2008 08:31:31 +0200

Thanks a lot Deepayan. Could you please inform me what update are you referring to, and give me some very vague sense when it might happen (within weeks, months, or years)?

Many thanks
Ola

2008/5/8 Deepayan Sarkar <deepayan.sarkar_at_gmail.com>:

> On 5/8/08, Ola Caster <ola.caster@gmail.com> wrote:
> > Dear help list,
> >
> > Is it possible to draw lattice histograms (i.e. use the histogram()
> function
> > and not the hist() function) with objects of class "Date"?
>
> Sort of. The default calculation of 'breaks' doesn't work, so
>
> histogram(~date, data=my.data)
>
> will currently fail (I will fix this in the next update). However,
>
> histogram(~date, data=my.data, breaks = 10)
> histogram(~date, data=my.data, breaks = "fd")
>
> etc., should work. The help page for histogram is somewhat ambiguous; it
> says:
>
> breaks:
>
> [...]
>
> Other valid values
> of 'breaks' are those of the 'breaks' argument in 'hist'.
> This allows specification of 'breaks' as an integer giving
> the number of bins (similar to 'nint'), as a character string
> denoting a method, and as a function.
>
> What is meant here is that valid values of breaks in 'hist.default'
> will work, not those for any other methods. In particular, breaks =
> "months" will not work.
>
> -Deepayan
>
> > I've tried solutions like
> >
> > histogram(~date, data=my.data, breaks="months")
> >
> > but it doesn't seem to work.
> >
> > Any suggestions are welcome.
> >
> > Many thanks
> > Ola Caster
>

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