> Unfortunately I can't get R to do the calculation for cor(nou,dak) when I
> use expression()..
>
> text(0,2.2,expression(paste(r[Pearson],"=", cor(nou,dak) , sep= "
> ")),pos=4,
> cex=1.5)
Use bquote() and its .() operator, as in
with(mtcars, {
plot(wt, mpg)
text(4, 30, bquote(r[Pearson] ~ "=" ~ .(cor(wt, mpg))))
})
Bill Dunlap
TIBCO Software
wdunlap tibco.com
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
> Behalf
> Of Tonja Krueger
> Sent: Friday, February 28, 2014 2:27 AM
> To: r-help@r-project.org
> Subject: [R] do calculation within expression(), text in plot
>
>
> Dear Helpers,
> I would like to add some text to my plot, containing a variable and the
> calculated value for the variable.
> As I would like to produce many plots, I hope this can be done
> automatically.
> Unfortunately I can't get R to do the calculation for cor(nou,dak) when I
> use expression()..
>
> text(0,2.2,expression(paste(r[Pearson],"=", cor(nou,dak) , sep= "
> ")),pos=4,
> cex=1.5)
>
> Is there a command that "stops" expression() so the result is calculated
> and
> printed in the plot?
> Thank you in advance,
> Tonja
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