| volume 
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             volume(r, z)  
 
     returns the zonal volumes of the 2-D cylindrical mesh (R, Z).  
     If R and Z are imax-by-jmax, the result is (imax-1)-by-(jmax-1).  
     The volume is positive when, say, Z increases with i and R increases  
     with j.  For example, volume([[0,0],[1,1]],[[0,1],[0,1]]) is +pi.  
interpreted function, defined at i0/std.i   line 2712  
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