New answers tagged summation
6
First of all, as you seem to indicate, you don't have the problem with accuracy if you use := (SetDelayed) in your function definitions instead of = (Set), although, as you say, with this change it takes longer to evaluate f. The accuracy improves because Mathematica will calculate the Hermite polynomials accurately when x is Real. Using Set for the ...
4
The problem has to do with precision in numerical approximations. During the evaluation of your function Mathematica has to deal with really huge numbers, so you have to make sure that during this computation everything is evaluated up to a very high precision. One way to achieve that is by specifying the initial argument with high precision. For example, if ...
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