[R] Question about 'text' (add lm summary to a plot)

[Gabor Grothendieck]

On 7/22/05, Thomas Lumley <tlumley at u.washington.edu> wrote:
> On Fri, 22 Jul 2005, Dan Bolser wrote:
> 
> > On Fri, 22 Jul 2005, Gabor Grothendieck wrote:
> >
> >> Try as.expression(bquote(...whatever...))
> >
> > Sob, wimper, etc.
> 
>   a<-7
>   plot(1)
>   legend("topleft",legend=do.call("expression",
>                      list(bquote(alpha==.(a)),bquote(alpha^2+1==.(a^2+1)))))
> 
> works for me.  The trick is getting the inner calls to bquote
> evaluated, since expression doesn't evaluate its argument.

I think legend accepts a list argument directly so that could be
simplified to just:

  a<-7
  plot(1)
  L <- list(bquote(alpha==.(a)),bquote(alpha^2+1==.(a^2+1)))
  legend("topleft",legend=L)

The same comment seems to apply to my prior suggestion about
as.expression(bquote(...)), namely that one can just write the
following as text also supports a list argument:


my.slope.1 <-   3.22
my.slope.2 <-   0.13
my.inter.1 <- -10.66
my.inter.2 <-   1.96

plot(1:5)
L <- list(
  "Intercept:", bquote(.(my.inter.1)%+-%.(my.inter.2)),
  "Slope:", bquote(.(my.slope.1)%+-%.(my.slope.2))
)
text(2, c(4,4,4.25,4.25), L, pos = c(2,4,2,4))