A fast procedure for the construction of quadrature formulas for bandlimited functions

07/28/2023

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by   Abinand Gopal, et al.

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We introduce an efficient scheme for the construction of quadrature rules for bandlimited functions. While the scheme is predominantly based on well-known facts about prolate spheroidal wave functions of order zero, it has the asymptotic CPU time estimate O(n log n) to construct an n-point quadrature rule. Moreover, the size of the “n log n” term in the CPU time estimate is small, so for all practical purposes the CPU time cost is proportional to n. The performance of the algorithm is illustrated by several numerical examples.