>>>>> Gregory Werbin <greg.wer...@libertymail.net>
>>>>> on Thu, 25 Aug 2016 15:21:05 -0400 writes:
> I've had a chance to read the source more thoroughly. The chain of
> events is as follows:
> 1. Local function `plotts()` is defined with argument `cex` that
> defaults to `par("cex")`
> 2. `...` is passed to `plotts()`. If "cex" is an element in `...`,
> inside `plotts()` the variable `cex` is assigned thereby (overriding the
> default arg). Importantly, this means that the element "cex" is captured
> and _removed_ from `...`. `...` is eventually passed to `plot.window()`.
> 3.
> - In the univariate case (NCOL(x) == 1): When `lines.default()` is
> called to actually plot the data
> (https://github.com/wch/r-source/blob/trunk/src/library/stats/R/ts.R#L588
> and
> https://github.com/wch/r-source/blob/trunk/src/library/stats/R/ts.R#L597
> for reference), `cex` is not included in the call.
> - In the bivariate case (NCOL(x) > 1): Because "cex" was captured and
> removed from `...`, it is not passed to `plot.default` when it is called
>
(https://github.com/wch/r-source/blob/trunk/src/library/stats/R/ts.R#L548).
> It turns out that the "eating" is not being done by `...` but by the
> signature of `plotts`.
> The documentation currently reads:
>> ...: additional graphical arguments, see 'plot', 'plot.default' and
>> 'par'.
> This, to me, suggests parity with the 'plot' function in how the
> arguments in '...' are handled. Therefore either the code is wrong or
> the documentation is incomplete and misleading.
the code is not perfect aka "wrong" .. so the bug is there.
Making the minimal reproducible example more concise,
plot(as.ts((-10:12)^3), type="b", cex=.5)
plot( ((-10:12)^3), type="b", cex=.5)
should plot identically ... but currently don't
> I filed this is as a bug because it's undocumented, and inconsistent
> with how other arguments typically passed through `plot.default` are
> handled.
> I'll be happy to do the patch myself -- I just need to know which thing
> to patch (the source or the docs).
[yes... and please subscribe to bugzilla which I told you
yesterday I had explicitly opened for you !]
Martin
> Greg
> On 2016-08-25 03:00, David Winsemius wrote:
>>> On Aug 24, 2016, at 5:59 PM, Gregory Werbin
>>> <greg.wer...@libertymail.net> wrote:
>>>
>>> I did a search on Bugzilla for "plot.ts" and didn't find anything on
>>> this issue. I tried to sign up for Bugzilla to report it, but my
>>> e-mail address didn't pass your "syntax checking" for a legal e-mail
>>> address.
>>>
>>> The bug is easily reproducible on my machine as follows:
>>>
>>> ## start
>>>
>>> # generate some data
>>> y <- arima.sim(list(), 150)
>>>
>>> # this will definitely dispatch to a ".ts" method
>>> class(y)[1] == 'ts'
>>>
>>> # compare and note that `cex = 0.5` has no effect
>>> plot(y, type = 'b', pch = 16)
>>> plot(y, type = 'b', pch = 16, cex = 0.5)
>>>
>>> # it works if `y` is coerced back to a regular vector
>>> plot(as.numeric(y), type = 'b', pch = 16, cex = 0.5)
>>>
>>> # another way to see the issue
>>> plot.ts(y, type = 'b', pch = 16, cex = 0.5)
>>> plot.default(y, type = 'b', pch = 16, cex = 0.5)
>>>
>>> ## end
>>>
>>> Skimming through source code for `plot.ts`, it seems like the `cex`
>>> argument is being "eaten" by a `...` somewhere without being properly
>>> passed to `plot.default`.
>>
>> '...' does not "eat" parameters, it passes them on.
>>
>> Looking at the very top of the body we see this in the definition of
>> the internal `plotts` function:
>>
>> cex = par("cex"), lty = par("lty"), lwd = par("lwd"),
>> axes = TRUE, frame.plot = axes, ann = par("ann"), cex.lab =
>> par("cex.lab"),
>> col.lab = par("col.lab"), font.lab = par("font.lab"),
>> cex.axis = par("cex.axis"), col.axis = par("col.axis"),
>>
>> And at the end of the body we se the call to plotts (including the
>> "dots")
>>
>> So I would suggest using par-settings.
>>
>> par(cex=0.5)
>> plot(y, type = 'b', pch = 16)
>>
>> (Question seems more appropriate for r-help.)
>>
>> --
>> David.
>>
>>> The output of `R.version` is:
>>> platform x86_64-apple-darwin15.5.0
>>> arch x86_64
>>> os darwin15.5.0
>>> system x86_64, darwin15.5.0
>>> status
>>> major 3
>>> minor 3.1
>>> year 2016
>>> month 06
>>> day 21
>>> svn rev 70800
>>> language R
>>> version.string R version 3.3.1 (2016-06-21)
>>> nickname Bug in Your Hair
>>>
>>> Greg
>>>
>>> ______________________________________________
>>> R-devel@r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>
>> David Winsemius
>> Alameda, CA, USA
> ______________________________________________
> R-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
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