[R] text-plotting math & regular mixed ?

Peter Dalgaard BSA
Tue, 29 Jun 1999 14:55:06 -0000

Martin Maechler <maechler at stat.math.ethz.ch> writes:

> i.e., can you ``fix'' the following function ?
>
> p.ex <- function(alpha = .05) {
>
>      x <- seq(0,1, len=101)
>      ch.a <- formatC(alpha,wid=1)
>      plot(x, x^alpha, main=
> 	  expression(paste("Power plot of ", x ^ alpha, " for
", alpha == {})))
>      ## Where can I pass  ch.a ??
>      invisible()
> }

Use substitute(). Something like

e<-substitute(expression(paste("Power plot of ", x ^ alpha, "
for ",
alpha == ch.a)), list(ch.a=formatC(alpha,wid=1)))

plot(x, x^alpha, main=e)

--
   O__  ---- Peter Dalgaard             Blegdamsvej 3
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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