On Oct 12, 2010, at 12:53 PM, Jared Blashka wrote:
I'm attempting to insert variables as expressions into labels for my
plots,
but I'm running into the issue that characters in my labels aren't
allowed
in expressions, notably '[' and ']'. An input string of "[^3H]5-CT"
needs to
be displayed as [3H]5-CT with the 3 as superscript. But brackets
aren't
particularly liked in expressions. I know I can do something like
mtext(expression(paste("[",phantom()^3,"H]5-CT (0.8 nM)")),3,2)
but "[^3H]5-CT" is saved as a single variable. I'm not really sure
what to
do other than splitting the string into sections that can and can't be
evaluated as expressions and then pasting as necessary.
bquote to the rescue!
> varname <- "[^3H]5-CT"
> plot(1,1,xlab=expression(varname)) # nope
> plot(1,1,xlab=bquote(.(varname)) ) # Yes
> plot(1,1,xlab=bquote(.(varname)*"(0.8 nM)") )
# Yes, note need for "*" or "~" as plotmath separator.
==
David Winsemius, MD
West Hartford, CT
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