On 14/02/12 13:56, Debashish Saha wrote: > for r in range (1,5): ... > z=r > mlab.mesh(x, y,z, colormap='Greens') ... > AssertionError: Array z must be 2 dimensional. And your question is? -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/