Christian Froeschlin wrote:

 > sqrt(((f(x+e,y,z)-f(x,y,z))/e)^2,
 >      ((f(x,y+e,z)-f(x,y,z))/e)^2,
 >      ((f(x,y,z+e)-f(x,y,z))/e)^2)

Oops that should have been

sqrt(((f(x+e,y,z)-f(x,y,z))/e)^2 +
      ((f(x,y+e,z)-f(x,y,z))/e)^2 +
      ((f(x,y,z+e)-f(x,y,z))/e)^2)

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