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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