From: ivo welch <ivowel_at_gmail.com>

Date: Sun 05 Feb 2006 - 07:28:24 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sun Feb 05 07:36:21 2006

Date: Sun 05 Feb 2006 - 07:28:24 EST

Dear R wizards:

I would love to write a general function that matches the slope of a plotted line in an xy-plot at a particular x,y location. something like

x<- (1:10)^2; y<- 40:50;

plot( x,y, type="l", xlim=c(0,90) )

srt.at5 = text.at.current.plot.with.slope( x, y, 5);
text( x[5],y[5], pos=3, srt=srt.at.5);

to do this, I first need to compute the function slope around x[5], which is an easy task. alas, the harder task is that I need to scale this by the plot aspect ratio and the axes. How can a function read this from the current plot?

(Has someone written such a function, perhaps more embellished, to save me the debugging effort?)

Or, is there an alternative to srt, which slopes the text relative to the existing scale?

help appreciated.

sincerely,

/ivo welch

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R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sun Feb 05 07:36:21 2006

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