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Setting breaks for histogram of dates

2 messages · Loris Bennett

Original
Loris Bennett
# 
Hi,

I have a list of dates like this: 

  date
  2009-12-03
  2009-12-11
  2009-10-07
  2010-01-25
  2010-01-05
  2009-09-09
  2010-01-19
  2010-01-25
  2009-02-05
  2010-01-25
  2010-01-27
  2010-01-27
  ...

and am creating a histogram like this

  t <- read.table("test.dat",header=TRUE)
  hist(as.Date(t$date), "years", format = "%d/%m/%y", freq=TRUE)
  
However, I would rather not label the breaks themselves, but instead
print the date with the format "%Y", between the breaks.

Is there a simple way of doing this?

Regards

Loris
1 day later
Loris Bennett
# 
Loris Bennett <loris.bennett at fu-berlin.de> writes:
With a little help from a chap called Jim who doesn't seem to have
replied to the list, I looked discovered 'axis' and came up with
this:

  > hist(as.Date(t$date),"years",format="%Y",freq=TRUE,xaxt="n")
  In hist.default(unclass(x), unclass(breaks), plot = FALSE, ...) :
    argument '...' is not made use of
  > axis(1,at=as.Date(c("2009-07-01","2010-07-01")),
      labels=c("2009","2010"),lwd=0,lwd.ticks=0)

I don't know what to make of the warning but the labels are placed as
I want.

Loris