Re: [R] hist of dates

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Wed 19 Oct 2005 - 02:30:04 EST

Pleae see ?hist.Date for how to use it, as you usage is nothing like the examples there.

However, I suspect you do not want a histogram but a barplot, as in

   with(dt_cycles, barplot(cycles, names=as.character(dates_releves)))

(You may want to adjust the font size or date format.

On Tue, 18 Oct 2005, herodote@oreka.com wrote:

> Hi all
>
> I wish to draw an histogram... with dates but the following append, i
> don't know where is the problem, help(hist.Date) works and i don't see
> any usefull information on what i'm doing wrong...
>
>> hist.Date(dt_cycles)
> Error: couldn't find function "hist.Date"
>> hist.date(dt_cycles)
> Error: couldn't find function "hist.date"
>> cycles
> [1] 7 1 2 5 14 5
>> dt_cycles
> dates_releves cycles
> 1 2005-07-01 7
> 2 2005-07-04 1
> 3 2005-07-06 2
> 4 2005-07-11 5
> 5 2005-07-25 14
> 6 2005-07-27 5
>> dates_releves<-as.Date(dates_releves)
>> hist(dates_releves,cycles)
> Error in hist.Date(dates_releves, cycles) :
> invalid specification of 'breaks'
>> hist(dates_releves~cycles)
> Error in hist.default(dates_releves ~ cycles) :
> 'x' must be numeric
>>
>
> Any ideas would be great...
> thks
> guillaume.

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Wed Oct 19 02:58:12 2005

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