[R] Two == expressions in bquote

[Henrique Dallazuanna]

Try this:

text(2,8, bquote(delta~'='~mu^2 == .(mu^2)))

On Mon, Jan 25, 2010 at 6:00 PM, Larry Hotchkiss <larryh at udel.edu> wrote:
> Hi,
>
> I want to put text on a plot containing something like: a = b^2 = <squared numeric value of b> using bquote.
>
> Example:
>
>  mu = 5
>  plot(1:10,1:10)
>  text(2,8, bquote(delta == mu^2))            # This works
>  text(2.5,8, bquote(phantom(0) == .(mu^2)))  # but is unpredictable
>
>  text(2,8, bquote(delta == mu^2 == .(mu^2))) # This doesn't work
>
> The last text function returns the error:
>
>     Error: unexpected '==' in "  text(2,8, bquote(delta == mu^2 =="
>
> The first two text functions work in this example, using a default graphics window on a 64-bit Windows machine, and either R 2.11.0 development edition for 64-bit Windows or R 9.2.2 on the same machine ((x 86)).
>
> I don't mind the two statements except that when trying to automate this by using the base x coordinate + epsilon*max(x), for example --
>
>  x <- 1:10
>  epsilon=0.05
>  text(2+esilon*max(x),8, bquote(phantom(0) == .(mu^2)))
>
> for the x position on the 2nd text function, the position of the additional text is not predictable.
>
> Thanks,
>
> Larry Hotchkiss
>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O