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Questions on the numerical functions of Mathematica, implementing numerical methods and numerical computing with Mathematica.

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Code to calculate the partial theta function

The version of the partial theta function I want to compute is $O(z) = \sum\limits^\infty_{n=0}\exp(-(z+n\pi)^2)$ Does anyone have or know of code to efficiently compute $O(z)$? There are two papers …
Charles Hagwood's user avatar