Rolf,
Your questions probably should go to a group focused on the ggplot package, not
a general R group where many do not use it.
A little judicious searching like "R ggplot use greek letters in text" gets you
some pointers that show how to do much more than Greek letters but more complex
mathematical style equations and that many aspects of ggplot support it and you
can use other functions like paste() to put more complex expressions together.
Similarly, your comments about wanting to have different scales showing in
multiple plots using facet_grid() or perhaps facet_wrap() might answer your
question as the manual page explains:
scales
Are scales shared across all facets (the default, "fixed"), or do they vary
across rows ("free_x"), columns ("free_y"), or both rows and columns ("free")?
So alter the line you use at the end to include a comma at the end of the
arguments followed by “scale=…” as needed.
But yes, truly independent graphs placed in a grid, after loading the packages
needed, gives even more options.
There are some very decent books and tutorials on many aspects of ggplot
including some that are free and on-line. Here is an earlier edition of one:
https://ggplot2-book.org/
Note especially this section on faceting:
https://ggplot2-book.org/facet.html
I will now go silent on ggplot-related questions 😉
-----Original Message-----
From: R-help <r-help-boun...@r-project.org> On Behalf Of Rolf Turner
Sent: Monday, July 19, 2021 7:24 PM
To: r-help@r-project.org
Subject: Re: [R] Plotting confidence intervals with ggplot, in multiple facets.
Thanks to Jeff Newmiller, Rui Barradas and Avi Gross for their extremely
helpful replies. I have got both Jeff's and Rui's code to run. I am currently
experimenting with Avi's suggestion of producing multiple plots and then
putting them together using plotgrid() or grid.arrange(). This idea seems to
me to be most promising in terms of a desideratum that the y-axis scales/limits
should be different on the two facets. Also the y-axis labels.
And speaking of y-axis labels: is it possible in ggplot() to get mathematical
notation in axis labels, titles and possibly other annotation? (In the manner
of plotmath() in base R graphics.) Specifically I'd like to get the Greek
letters alpha and beta in the y-axis labels. In base R graphics I'd do
something like ylab=expression(paste("bias in ",beta)) . Is there an
appropriate analogue in ggplot()? (I think that I may have asked this question
before, some time back, but have forgotten the answer.)
cheers,
Rolf
P.S. The following is kind of apropos of nothing, but it might serve as a
useful warning to others of a Trap for Young Players. I nearly went mad
(madder?) for a very long time when trying to get Rui's code to run.
I kept getting errors of the form:
> Error in source("scr.Rui") : scr.Rui:6:2: unexpected input
> 5: ggplot(eg, aes(Ndat, estimate)) +
> 6:
> ^
Took me an unconscionably long while to figure out what was going on.
I could not see why Jeff's code ran without problem, while Rui's (which was
very similar) fell over. Turns out the second character in the offending line
is a non-printing character, the 160th member of the ASCII character set. (It
can be produced using "\u00A0".) Apparently this is a "non-breaking space".
Whatever that means. It does NOT get treated as white space in the usual way,
and triggers the foregoing error.
Presumably this invisible character got introduced, into the code that Rui
emailed, by one of the (many!) infuriating idiosyncrasies of Windoze. Yet
another reason, among the many millions of such, not to use Windoze.
R.
--
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
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