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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