[R] Greek characters in plots

[michael watson (IAH-C)]

Excellent, many thanks, that works a treat!

But I don't understand how...

>bquote(.(tag) ~ Delta * .(suffix))
"A)" ~ Delta * "stbA::cat"

Yet when I use:

plot(1, main = bquote(.(tag) ~ Delta * .(suffix)))

It works fine in the plot.

Must be magic ;)

-----Original Message-----
From: Gabor Grothendieck [mailto:ggrothendieck at gmail.com]
Sent: Tue 05/08/2008 6:18 PM
To: michael watson (IAH-C)
Cc: r-help at r-project.org
Subject: Re: [R] Greek characters in plots
 
Try bquote / substitute as has been mentioned:

tag <- "A)"
suffix <- "stbA::cat"
plot(1, main = bquote(.(tag) ~ Delta * .(suffix))))


2008/8/5 michael watson (IAH-C) <michael.watson at bbsrc.ac.uk>:
> OK, I am definitely struggling here.
>
> The text I am trying to plot isn't a mathematical expression, it's:
>
> A) ?stbA::cat
>
> 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?
>
> Thanks once again
>
> Mick
>
> -----Original Message-----
> From: Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
> Sent: 05 August 2008 12:40
> To: michael watson (IAH-C)
> Cc: Henrique Dallazuanna; r-help at 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:wwwhsd at gmail.com]
>> Sent: 05 August 2008 12:17
>> To: michael watson (IAH-C)
>> Cc: r-help at 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)
>> <michael.watson at bbsrc.ac.uk> 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
>>>
>>> The information contained in this message may be confide...{{dropped:14}}
>>>
>>> ______________________________________________
>>> R-help at 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.
>>>
>>
>>
>>
>> --
>> Henrique Dallazuanna
>> Curitiba-Paraná-Brasil
>> 25° 25' 40" S 49° 16' 22" O
>>
>> ______________________________________________
>> R-help at 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.
>>
>
> --
> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> 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 at 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.
>