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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