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The Lanczos-preconditioned, folded (sin x)/x interpolator produces a selected number of interpolated values between sequential pairs of equally spaced data without changing the values in the original data set. Best results are obtained when the original data appear to be composed of a group of trigonometric functions. This report presents a development of the interpolator and lists a computer program for its implementation. The program was developed for use on a desktop, standalone computer and was written in the extended BASIC language used by the Tektronix 4-051 Graphic System.

The Lanczos-preconditioned, folded (sin x)/x interpolator; discussion and desktop-computer program in BASIC