Wasn't it Justace Clutter who wrote:

>So we learn from this that the sum function is just not to be trusted here.
>I guess that I shall be needing to use something else.

You could always perform the summation in POV code, rather than using
sum(). Like this:-

  function {
      z
      #declare n=1;
      #while (n<50)      
        +((40/(n*pi)))*(cos(n*pi)-cos((n*pi)/2))*sin((n*pi*x)/10)
                          *exp(-1*(((pow(n,2)*pow(pi,2))/100)*0))
        #declare n=n+1;  
      #end
  }
  max_gradient 86



-- 
Mike Williams
Gentleman of Leisure

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