Improved algorithm for calculating the Chandrasekhar function. Nature of problem: An attempt has been made to develop a subroutine that calculates the Chandrasekhar function with high accuracy, of at least 10 decimal places. Simultaneously, this subroutine should be very fast. Both requirements stem from the theory of electron transport in condensed matter. Solution method: Two algorithms were developed, each based on a different integral representation of the Chandrasekhar function. The final algorithm is arrived at by mixing these two algorithms selecting the ranges of the argument omega in which performance is the fastest.
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