[R] How to draw the graph of f(x,y) = x * y ?

Duncan Murdoch murdoch at stats.uwo.ca
Tue Sep 23 19:32:10 CEST 2008

On 9/23/2008 12:54 PM, Paul Smith wrote:
> Dear All,
> The function curve() draws the graph of functions from R to R. Is
> there some homologous function to curve() to draw functions from R^2
> to R?

No, you would have to write it yourself.  The basic idea is to use 
outer() to construct a matrix of function evaluations, then plot the 
matrix using persp, contour, image, rgl::persp3d, etc.  There are 
examples on the ?contour man page.

Duncan Murdoch

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