Message-ID: <E66794E69CFDE04D9A70842786030B933FA8F174@PA-MBX01.na.tibco.com>
Date: 2014-02-28T19:58:27Z
From: William Dunlap
Subject: do calculation within expression(), text in plot
In-Reply-To: <trinity-eb7f6903-14d4-4cc8-8164-d1b6e6fc5071-1393583217913@3capp-webde-bs18>
> 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-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf
> Of Tonja Krueger
> Sent: Friday, February 28, 2014 2:27 AM
> To: r-help at 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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