how to do a 3d polar plot

• Subject: how to do a 3d polar plot
• From: berkeleylab
• Date: Tue, 12 Feb 2013 10:32:11 -0800

I want to make a 3d plot and using r and phi as variable. I can try to plot withplot3d(ev(f(r,phi),r=sqrt(x^2+y^2),phi=atan2(x,y),[x,x1,x2],[y,y1,y2]);
but it will give me the atan2(0,0) not defined.
Is there a standard way to plot a 3d plot on polar axis? 		 	   		  

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