[R] hist of dates

[Prof Brian Ripley]

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 at 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 at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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