[R] Contour plot crest line

[Spencer Graves]

	  Have you studied the examples on the help pages for "contour" and 
"persp"?  Also, if my memory is correct, there is some useful 
information this on Venables and Ripley, Modern Applied Statistics with 
S, 4th ed. (Springer).

	  spencer graves

Michael Kubovy wrote:

> Any suggestions about drawing the ridge line on a response surface  
> represented as a contour plot?
> 
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