>>>>> Martin Maechler <maech...@stat.math.ethz.ch>
>>>>> on Fri, 26 Aug 2016 09:31:41 +0200 writes:
>>>>> 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
And there are more (such) problems,
E.g, lty, and lwd are not propagated, in the (x,y) case,
plot.ts(as.ts(1:300), cumsum(rnorm(300)), type = "b", cex = 0.5, lwd = 2)
and also not in the "multiple" / matrix case.
I will commit a fix to R-devel in a moment... but would be glad
for a careful review.
Martin
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