On Tue, 5 Aug 2008, michael watson (IAH-C) wrote:
OK, I am definitely struggling here.
The text I am trying to plot isn't a mathematical expression, it's:
A) ΔstbA::cat
OK, so you want a Greek character and not a Greek symbol. As I said they
are different (different fonts, different shapes aka glyphs).
This is biological notation for a particular mutation. The "A)" part is
a tag identifying the graph, and the "stbA::cat" bit is the gene that is
mutated. Both the tag and gene are set as variables in a loop, and only
the delta remains the same.
As the text I am trying to plot isn't a mathematical expression, I seem
to be having trouble getting substitute() and expression() to do what I
want. As plotmath states "A mathematical expression must obey the
normal rules of syntax for any R expression", I fear I may be barking up
the wrong tree!
Thank you all for your help so far, but can someone please help me once
more and tell me how I can get the capital Delta symbol so I can use it
in non-mathematical text and strings for plotting?
a <- "A)"
b <- "stbA::cat"
paste(a, "\u0394", b)
(Number from http://www.alanwood.net/unicode/greek.html .) This should
work in a UTF-8 locale and also on Windows (in a windows() device or in
the Rgui console).
Thanks once again
Mick
-----Original Message-----
From: Prof Brian Ripley [mailto:[EMAIL PROTECTED]
Sent: 05 August 2008 12:40
To: michael watson (IAH-C)
Cc: Henrique Dallazuanna; r-help@r-project.org
Subject: Re: [R] Greek characters in plots
On Tue, 5 Aug 2008, michael watson (IAH-C) wrote:
Excellent! I even tried DELTA but not Delta....
?plotmath says
'Alpha' - 'Omega' uppercase Greek symbols
How could that be made clearer?
(Note it carefully says Greek *symbols* not *character*: they are not the
same thing.)
Now, how do I go about pasting that with some text that I have in various other
variables?
Use substitute? E.g.
substitute(expression(foo*Delta), list(foo=3))
(Some people prefer bquote, but that is just a wrapper for substitute in
R.)
-----Original Message-----
From: Henrique Dallazuanna [mailto:[EMAIL PROTECTED]
Sent: 05 August 2008 12:17
To: michael watson (IAH-C)
Cc: r-help@r-project.org
Subject: Re: [R] Greek characters in plots
Try,
expression(Delta)
On Tue, Aug 5, 2008 at 8:14 AM, michael watson (IAH-C)
<[EMAIL PROTECTED]> wrote:
Hi
I am running an R script that creates 100s of graphs, and I need to use
the greek CAPITAL letter delta in the mtext() function.
I got as far as expression(delta) but this gives me the lowercase
version.
Can anyone help? I'm using R 2.7 on Windows XP
Mick
Head of Informatics
Institute for Animal Health
Compton
Berks
RG20 7NN
01635 578411
http://www.iah.ac.uk/research/bioinformatics/bioinf.shtml
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Henrique Dallazuanna
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
