[R] problem with hist() for 'times' objects from 'chron' package

Bojanowski, M.J. (Michal) M.J.Bojanowski at fss.uu.nl
Fri Jun 23 18:27:45 CEST 2006

Hello dear useRs and wizaRds,

I encountered the following problem using the hist() method for the
'times' classes
from package 'chron'. You should be able to recreate it using the code:


# pasted from chron help file (?chron)
dts <- dates(c("02/27/92", "02/27/92", "01/14/92", "02/28/92",

hist(dts) # which yields:

# Error in axis(side, at, labels, tick, line, pos, outer, font, lty,
lwd,  : 
#        'label' is supplied and not 'at'
# In addition: Warning messages:
# 1: "histo" is not a graphical parameter in: plot.window(xlim, ylim,
log, asp, ...) 
# 2: "histo" is not a graphical parameter in: title(main, sub, xlab,
ylab, line, outer, ...)

The plot is produced, but there are no axes.

As far as it goes for the warnings I looked in the sources and I think
they are caused
by hist.times() in package 'chron' which is calling the barplot() with
the histo=TRUE,
whereas neither barplot(), plot.window(), title() nor axis() seem to
accept this argument.

Am I doing something wrong or there is something not right with the
hist.times method?

Kind regards,


PS: I'm using R 2.3.1 on Windows XP and:

> sessionInfo()
Version 2.3.1 (2006-06-01) 

attached base packages:
[1] "methods"   "stats"     "graphics"  "grDevices" "utils"
[7] "base"     

other attached packages:


Package:       chron
Version:       2.3-3
Date:          2006-05-09
Author:        S original by David James <dj at research.bell-labs.com>, R
               port by Kurt Hornik <Kurt.Hornik at R-project.org>.
Maintainer:    Kurt Hornik <Kurt.Hornik at R-project.org>
Description:   Chronological objects which can handle dates and times
Title:         Chronological objects which can handle dates and times
Depends:       R (>= 1.6.0)
License:       GPL
Packaged:      Fri May 12 09:31:49 2006; hornik
Built:         R 2.3.0; i386-pc-mingw32; 2006-05-13 12:21:51; windows 

Michal Bojanowski
ICS / Utrecht University
Heidelberglaan 2; 3584 CS Utrecht
Room 1428
m.j.bojanowski at fss.uu.nl

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