Bert: inline
On 2012-05-13 7:43, Bert Gunter wrote:
Peter/David:
1. For some reason, I didn't see Peter's reply on r-help.
2. To Peter: Aha!!
Let me play this back to you. In
text(1,1,labels=expression(atop(atop(sigma,"some text"),"another
level")),cex = 2)
The (outer) whole atop() specification is allocated twice the amount
of space that would be required for the current font size, cex =1.
Then each of the top and bottom is allocated the amount of space
needed within this cex = 2 space. For the inner atop to fit within
that allocated amount of space, its top and bottom must get smaller,
of course. N'est-ce pas?
Yes, that's my understanding. With your text() call above, the
size of "another level" is what text(x,y,lab="another text",cex=2)
will print.
This makes sense to me! My misunderstanding is thinking that cex
applied to the individual text components, not the entire expression.
Enlightenment much appreciated.
3. However, this now begs the question of how to keep all text and
symbols the same size, which is really what the OP really wanted (a
way to emulate multiple lines). I'll fool around with this to see what
I come up with now that I'm enlightened -- or see if you or David come
up with something clever.
I don't think it's possible to nest atop()s and have all members
of the same cex.
Anyway, atop() is really the wrong tool for this sort of thing.
It can be a useful quick fix, but I usually prefer the 'multiple
lines' approach for its greater flexibility.
Peter Ehlers
Cheers,
Bert
On Sat, May 12, 2012 at 9:27 PM, David Winsemius<dwinsem...@comcast.net> wrote:
On May 12, 2012, at 6:27 PM, Peter Ehlers wrote:
Hi Bert,
I think the 'cex=' argument applies to the outermost 'atop()'.
It then applies that size specification to each of the two
components of the atop(a,b). If one of the components is itself
another atop(a,b), then the individual parts are sized downward
to produce the required cex for the unit.
As for the 'cex=1:2' specification, only the first value is used.
Isn't there also a 0.67 factor being applied to whatever was the "outside"
size prior to being used for the atop arguments? So the inner atop arguments
get that applied twice if I understand correctly.
text(1,1,labels=expression(atop(
atop("top level one", "top level two"),
"another level")
) )
I did notice that the cr-linefeed (perhaps unintentionally being inserted by
a mail client) seemed to be "working" at least on my Mac :
plot(1,1)
text(1,1,labels=expression("another
level")
)
Whereas it is well known that "\n" will appear as two characters, \n, and
not be interpreted as a special.
--
David
Cheers,
Peter Ehlers
On 2012-05-12 14:05, Bert Gunter wrote:
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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West Hartford, CT
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