[Rd] ggplot2/plyr interaction with latest R-devel?

[Ben Bolker]

Further losing my marbles.  I *think* this is a subtle bug in the
comparison operator for package_version objects that will be dependent on
small (platform-dependent) numerical computation differences, possibly
(???) introduced in r66259.

If I have not completely lost it (which is entirely possible), the problem
stems from the fact that floor(log(8,base=8L)) is 0 rather than 1 on my
machine, since log(8,base=8L) is slightly less than 1 rather than equal to
1.  All of the following possibly entertaining code comes from excavating
the guts of src/library/base/R/version.R : this file was changed on July 27
<
https://github.com/wch/r-source/commit/ce6732242c0757e07ebc4a5efb7d210cba6a0cfa>
, which makes me suspicious, but I don't see directly how the modifications
would have broken this.

## basic sanity-test of package version comparison
as.package_version("1.0.0")>=as.package_version("0.9.9")  ## TRUE

## the specific comparison I'm trying to make:
(e1 <- as.package_version("1.8.1"))>=(e2 <- as.package_version("1.7.1"))
## FALSE (!!!)
unclass(e1)  ## 1 8 1
unclass(e2)  ## 1 7 1

## part of the internal function operation .encode_numeric_version
intwid <- log(max(unlist(e1), unlist(e2), 1L, na.rm = TRUE), base = 8L)
## (why base 8? Tom Lehrer: "base eight is just like base ten really if
you're missing two fingers")
## I can see that we're sprintf()ing the results in octal a few lines later
...)
## 1  -- looks OK, but:

intwid-1 ## [1] -1.110223e-16
width <- floor(intwid) + 1L  ## this is the calculation that actually gets
done:
##
## 1 ## should be 2

log(8, base=8L)-1
log(8, base=8)-1
logvals <- setNames(log(2:25,base=2:25)-1,2:25)
logvals[logvals!=0]  ## 5,8,14,18,19,25 all == .Machine$double.eps/2


w1 <- .encode_numeric_version(e1, width = width, maxlen = maxlen) ## "1101"
w2 <- .encode_numeric_version(e2, width = width, maxlen = maxlen) ## "171"
w1>w2  ## FALSE

w1A <- .encode_numeric_version(e1, width = 2, maxlen = maxlen) ## "011001"
w2A <- .encode_numeric_version(e2, width = 2, maxlen = maxlen) ## "010701"
w1A>w2A  ## TRUE


If I had the patience I would revert to before this SVN change and see what
happened:

=================
r66259 | hornik | 2014-07-27 15:45:29 -0400 (Sun, 27 Jul 2014) | 2 lines

Have .encode_numeric_version() pad to common length with trailing zeros.
Add [<-.numeric_version().




On Mon, Sep 1, 2014 at 4:16 PM, Ben Bolker <bbolker at gmail.com> wrote:

> thanks -- although I think `dplyr` is a red herring; my issue is with
> `plyr` (which is imported by `ggplot2` so should get installed
> automatically anyway ...)
>
>
> On Mon, Sep 1, 2014 at 4:08 PM, Carl Boettiger <cboettig at gmail.com> wrote:
>
>> Hi Ben,
>>
>> Just tested this on a fresh ubuntu 14:04 sandbox by using Dirk's docker
>> image (
>> https://github.com/eddelbuettel/docker-ubuntu-r/tree/master/add-r-devel-san)
>> for Rdevel.
>>
>> > install.packages(c("dplyr", "ggplot2"))
>> > library("dplyr")
>> > library("ggplot2")
>>
>> runs fine for me (though takes a few minutes to compile everything). So
>> it seems you must have done something to your local environment, but not
>> sure what.
>>
>>
>>
>>
>> On Mon, Sep 1, 2014 at 11:42 AM, Ben Bolker <bbolker at gmail.com> wrote:
>>
>>>
>>>   I apologize in advance for not having done more homework in advance,
>>> but thought I would send this along to see if anyone else was seeing
>>> this.
>>>
>>>   I am having some sort of ggplot2/plyr/very-recent-R-devel dependency
>>> issues.
>>>
>>>   Just installed
>>>
>>> R Under development (unstable) (2014-09-01 r66509) -- "Unsuffered
>>> Consequences"
>>>
>>>  from source.
>>>
>>> > packageVersion("ggplot2")
>>> [1] ‘1.0.0’
>>> > packageVersion("plyr")
>>> [1] ‘1.8.1’
>>>
>>> library(plyr) works
>>>
>>>   but then I get:
>>>
>>> library(ggplot2)
>>> Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck =
>>> vI[[i]]) :
>>>   namespace ‘plyr’ 1.8.1 is being loaded, but >= 1.7.1 is required
>>> Error: package or namespace load failed for ‘ggplot2’
>>>
>>>   I don't remember when I most recently updated my r-devel (it was
>>> probably a few months old); nothing in recent commits rings a bell.
>>>
>>>   Works fine on R version 3.1.1 (except for a "ggplot2 built under
>>> 3.2.0 warning").
>>>
>>>   Does anyone else see this or is it just something weird about my setup?
>>>
>>>   Ben Bolker
>>>
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>
>>
>>
>> --
>> Carl Boettiger
>> UC Santa Cruz
>> http://carlboettiger.info/
>>
>
>

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