Dear R-help,

I would like to ask you how to find the critical points of a function of
several variables such as the following one:

x = seq(-10,10,0.2)
y = seq(-10,10,0.2)
zfunc = function(x,y) x^2 + y^2
z = outer(x,y,zfunc)
persp(x,y,z,theta = 30,phi=1,ticktype='detailed')


Thanks

Edoardo

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