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polar graph : invisible axis

Hi everyone,

Do someone know how to make invisible the axis of a polar graph ?

Here's an example on wich I don't manage to eliminate the axis :

rho=2.4:0.1:3.2;theta=(1/3:0.02:1/2)*%pi; z=30+round(theta'*(1+rho^2)); f=gcf(); f.color_map=hotcolormap(128);clf();graypolarplot(theta,rho,z)

Thanks in advance,

Bilaz38

Scilab