[R] Plotmath bug or my misunderstanding?

[Uwe Ligges]

On 13.05.2012 14:37, Rui Barradas wrote:
>
> Hello,
>
> It seems like a "feature". When trying the example below with more
> atops, the two bottom most lines, and only those two lines, feature
> character expansion relative to the default size and relative to the
> line before last.
>
> plot(1, type="n", xaxt='n', yaxt='n', ann=FALSE, xlim=c(-0.5, 6))
> text(1, 1,labels=expression(atop(atop(sigma,"some text"),
> "another level")), cex = 2)
> text(3, 1, labels=expression(atop(atop(atop(sigma,"some text"),
> "another level"), "third")), cex = 2)
> text(5, 1, labels=expression(atop(atop(atop(atop(sigma,"some text"),
> "another level"), "third"), "4th")), cex = 2)
>
> Anyway, I couldn't find this behavior in the help pages.

Of course, the size is adapted. LaTeX would also adapt the size of, 
e.g., the symbols in a fraction compared to regular text.

Uwe Ligges


>
> Rui Barradas
>
>
> Em 13-05-2012 11:00, Bert Gunter escreveu:
>> Date: Sat, 12 May 2012 14:05:26 -0700
>> From: Bert Gunter<gunter.berton at gene.com>
>> To:r-help at r-project.org
>> Subject: [R] Plotmath bug or my misunderstanding?
>> Message-ID:
>> <CACk-te0syHj9XjbkfHPYtCMwyWtYdPFYCehxGpxidtBR0_PkdQ at mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> This is a followup to a recent post on using atop() to obtain
>> multiline expressions.
>>
>> My reading of the plotmath docs makes it clear that issuing (in base
>> graphics) the specification
>>
>> par(cex = 2)
>>
>> doubles symbols and regular text in subsequent plotmath expressions.
>> However, it is unclear to me what specifying cex_within_ the
>> annotation function using plotmath should do, and the following seems
>> to want to have it both ways: ignore/obey )or maybe recycle?)
>>
>> plot(1,type="n", xaxt='n', yaxt='n', ann=FALSE)
>> text(1,1,labels=expression(atop(sigma,"some text")),cex = 2)
>> ## obeys the cex specification in symbols and text
>>
>> HOWEVER
>>
>> plot(1,type="n", xaxt='n', yaxt='n', ann=FALSE)
>> text(1,1,labels=expression(atop(atop(sigma,"some text"),"another
>> level")),cex = 2)
>> ## ???
>>
>> For even more fun, try:
>>
>> plot(1,type="n", xaxt='n', yaxt='n', ann=FALSE)
>> text(1,1,labels=expression(atop(atop(sigma,"some text"),"another
>> level")),cex = 1:2)
>> ##????
>>
>> So I confess to being flummoxed. Enlightenment would be much appreciated.
>>
>> Cheers,
>> Bert
>
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