On Oct 4, 2010, at 10:11 AM, Thomas Stewart wrote:
Try
expression(paste(integral(),"f(",tau,") d",tau,sep="")))
it works for me.
It does "work" (albeit without properly including the requested limits
of integrations), but if it is used as a teaching example, it will
obscure the syntax of plotmath expressions. A simple version that gets
the same result is:
expression(integral()*f(tau)*d*tau))
Plotmath expressions are parsed from unquoted text with proper non-
printing separators being "~" for space and "*" for juxtaposition. The
plotmath paste() is not really the same as the base function paste(),
despite identical names and its main value is as a method for allowing
commas to also be used as separators. Frankly I'm a bit surprised you
got away with adding the undocumented sep="" argument. My reading of
the help page for plotmath would have lead me to predict that the text
'sep=""' should appear in the output. Instead the "sep=" is ignored
and the text string is appended to the end of the expression
Try for instance:
plot(1,1, main=expression(paste(a,b,c,d, sep="-") ) )
--
David.
-tgs
On Mon, Oct 4, 2010 at 9:25 AM, Czerminski, Ryszard <
ryszard.czermin...@astrazeneca.com> wrote:
I would like to use greek "tau" as a symbol of variable to integrate
over in plotmath
expression(integral(f(tau)*dtau, 0,t))
but nothing seems to work. I tried d{\tau}, d\tau, etc.,
without any success
Is it possible? How can I accomplish this?
Best regards,
Ryszard
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David Winsemius, MD
West Hartford, CT
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