Many thanks Bill Dunlap.
You are correct that `lapply` calls `as.list`, which I should have seen if I
had looked a little harder.
Whether that would have led me to locate `as.list.POSIXlt` is another matter.
Best wishes.
From: William Dunlap <wdun...@tibco.com>
Sent: 14 February 2019 20:03
To: Newell, Paul
Cc: r-help@r-project.org
Subject: Re: [R] POSIXlt class and lapply
Somewhere between R-3.3.3 and R-3.5.2 a POSIXlt method for as.list() was added,
and lapply probably calls as.list().
> RCompare(methods("as.list"))
R version 3.3.3 (2017-03-06) | R version 3.5.1
(2018-07-02)
[1] as.list.data.frame as.list.Date | [1] as.list.data.frame
as.list.Date
[3] as.list.default as.list.environment | [3] as.list.default
as.list.environment
[5] as.list.factor as.list.function | [5] as.list.factor
as.list.function
[7] as.list.numeric_version as.list.POSIXct | [7]
as.list.numeric_version as.list.POSIXct
see '?methods' for accessing help and source code | [9] as.list.POSIXlt
| see '?methods' for
accessing help and source code
Bill Dunlap
TIBCO Software
wdunlap tibco.com
On Thu, Feb 14, 2019 at 9:45 AM Newell, Paul <paul.new...@metoffice.gov.uk>
wrote:
Dear R-helpers,
We have recently upgraded from R-3.3.1 to R-3.5.2.
It seems there has been a change in behaviour of `lapply` and the `POSIXlt`
class that I cannot find explicitly documented.
In R-3.3.1:
> lapply(as.POSIXlt(Sys.Date()), length)
$sec
[1] 1
$min
[1] 1
$hour
[1] 1
$mday
[1] 1
$mon
[1] 1
$year
[1] 1
$wday
[1] 1
$yday
[1] 1
$isdst
[1] 1
whereas, in R-3.5.2:
> lapply(as.POSIXlt(Sys.Date()), length)
[[1]]
[1] 1
Is this change in behaviour intentional?
Realistically, I cannot see anything documented to say that `lapply` should
behave as per R-3.3.1 on a `POSIXlt` object, so it is/was perhaps unwise to
rely on it.
Best wishes,
Paul Newell
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______________________________________________
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