[R] Surface Graphic

[Marcos Sanches]

Hello list!

I have a problem with the function 'persp'. I have a data set with the
variables
X -> The X coordenate of the insect
Y -> The Y coordenate of the insect
deep-> how deep the insect buried into the soil.

I would like to have a plot with a surface simulating the way the insect
buried. Is it possible? If I type

persp(x,y,deep)

R gives me this error message

Error in persp.default(X, Y, deep) :
        increasing x and y values expected

How do I overcome this?

Thanks,

Marcos

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