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Arnold, P1788 On 14 Oct 2010, at 15:23, Arnold Neumaier wrote: > Here is my answer to your challenge... below is an improved version. Thank you Arnold. Of course the key is "y=domain(x);" on line 94 of your code (taking "% Consider an interval datatype..." as line 1), which "wipes clean" the interval before putting it back in the function. God is in the details. John Pryce