[Rd] all.equal doesn't work for POSIXlt objects

Joris Meys jorismeys at gmail.com
Mon Aug 8 00:26:03 CEST 2011

Hi all,

following sample code illustrates the problem :

  Date1 <- Date2 <-

identical() gives the correct answer. As there is no all.equal method
for POSIXlt objects, all.equal.list is used instead. Subsetting using
[[]] doesn't work on POSIXlt objects. I solved the problem by adding a
function all.equal.POSIXlt() :

all.equal.POSIXlt <- function(target, current, ..., scale=1) {
  check_tzones(target, current)
  target <- unclass(target)
  current <- unclass(current)

This seems to work bugfree, but I'm not sure about it. So am I doing
it correct, and if so, can this be added to the next R release? I'm
not sure where else I should drop this proposal...


Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control

tel : +32 9 264 59 87
Joris.Meys at Ugent.be
Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php

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