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Numerical evaluation of the Gauss hypergeometric function: Implementation and application to Schramm-Loewner evolution
K. J. Schrenk, J. D. Stevenson
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Numerical studies of fractal curves in the plane often focus on subtle geometrical properties such as their left passage probability. Schramm-Loewner evolution (SLE) is a mathematical framework which makes explicit predictions for such features of curve ensembles. The SLE prediction for the left passage probability contains the Gauss hypergeometric function ₂F₁. To perform computational SLE studies it is therefore necessary to have a method for numerical evaluation of ₂F₁ in the relevant parameter regime. In some instances, commercial software provides suitable tools, but freely available implementations are rare and are usually unable to handle the parameter ranges needed for the left passage probability. We discuss different approaches to overcome this problem and also provide a ready-to-use implementation of one conceptually transparent method.
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