On Jun 28, 2011, at 2:52 PM, array chip wrote:
Thank you David for the obvious fix and sorry for my lacking
innovative spirit,
:-)
Really, I know I haven't grasped the essence of plotting these math
symbols in
R.
A lot of people (including me) have had trouble understanding to to
write proper plotmath code. Here's my 10 cent version of an
intro...things that were not clear to me on first, second, or third
reading of the help(plotmath) page. (I am not saying these things are
not in the page, just that they were not clear to me after multiple
efforts at digestion. Searching r-help archives for worked examples
was the most productive learning strategy.)
The stuff on left side of the table in the plotmath help page
represent the "special words and symbols" and they need to be
separated with the proper operators, since spaces are ignored (as
actually happens in R parsing as well but we are generally shielded
form that fact). Words other than these specials can be entered
without quotes since expressions are not evaluated. The list of greek
letters is not complete. Not all of the script greeks work. The "*"
and "~" operators are the usual way to separate plotmath sub-
expressions with either no-space or space displayed respectively.
Commas are also special in separating individual expression values, so
don't use them unless you want a multiple expression value (or need
them inside a plotmath 'paste' or 'list'). You generally do not want
multiple values of expression vector when constructing 'main' or 'sub'
arguments, but may need them when constructing labels for plot axes.
Only use quotes when they are really needed. You need to construct the
arguments so that infix operations have flanking operands and notice
that the plotmath paste function has no sep argument.
John
----- Original Message ----
From: David Winsemius <dwinsem...@comcast.net>
To: array chip <arrayprof...@yahoo.com>
Cc: Peter Ehlers <ehl...@ucalgary.ca>; R <r-help@r-project.org>
Sent: Tue, June 28, 2011 11:50:02 AM
Subject: Re: [R] how to print "<=" in plot title
On Jun 28, 2011, at 2:42 PM, array chip wrote:
David,
I tried your suggestion, still not working:
x<-3
plot(1:10)
title(bquote(bold(x) <= bold(as.character(.(x)) )))
It prints x<=as.character(3) as title
Kids these days! No innovative spirit. Why in my day... they would be
jumping with the obvious fix to an elder's error.
x<-3
plot(1:10)
title( bquote(bold(x) <= bold(.(as.character(x)) )))
--
David.
Thanks
John
----- Original Message ----
From: David Winsemius <dwinsem...@comcast.net>
To: array chip <arrayprof...@yahoo.com>
Cc: Peter Ehlers <ehl...@ucalgary.ca>; R <r-help@r-project.org>
Sent: Tue, June 28, 2011 11:30:23 AM
Subject: Re: [R] how to print "<=" in plot title
On Jun 28, 2011, at 2:19 PM, array chip wrote:
Thank you David and Bert.
x<-3plot(1:10)
title(bquote( x <= .(x) ))
would do what I want. But I also want the title printed in bold
font. so I
tried
x<-3
plot(1:10)
title(bquote(bold(x <= .(x)) ))
But this did not print the "less than equal to" symbol and the
number 3 (from
variable x) in bold. Anyway to solve that?
Nope. The Symbol font has no bold type face. Bolding of numbers
_can_ be done
inside bquote with bold(as.character(.(x)) )
--David
Thanks again!
John
----- Original Message ----
From: David Winsemius <dwinsem...@comcast.net>
To: Peter Ehlers <ehl...@ucalgary.ca>
Cc: array chip <arrayprof...@yahoo.com>; R <r-help@r-project.org>
Sent: Tue, June 28, 2011 11:04:07 AM
Subject: Re: [R] how to print "<=" in plot title
On Jun 28, 2011, at 1:52 PM, Peter Ehlers wrote:
On 2011-06-28 10:25, array chip wrote:
Hi, how can I print "<=" (I mean the symbol of just one
character) in the
main
title of a plot?
for example:
plot(1:10, main=paste("x<=", x))
where variable x is some number generated on the fly.
x <- 2.718
plot(0, 0)
title(bquote( x %<=% .(x) ))
I think John wants the mathematical symbol. As was pointed out in a
question
last week, the `<=` plotmath symbol needs to be flanked by operands.
Non-printing operands can be created with the phantom function:
title(main=expression(phantom("")<=phantom("")) )
Contrary to Gunters's comment, this is probably going to work on
all the three
major OS platforms. It depends only on whether there is a Symbol
font mapped
to
the output device.
?plotmath
Yes. The details are there.
Peter Ehlers
David Winsemius, MD
West Hartford, CT
David Winsemius, MD
West Hartford, CT
David Winsemius, MD
West Hartford, CT
David Winsemius, MD
West Hartford, CT
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