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Table driven interpolation module. Supports linear and spline modes.

Discussion

This module performs table lookup using unevenly spaced X and Y values. The module supports linear and pchip interpolation. Internally the interpolation is performed using a piece wise polynomial approximation. With linear interpolation a first order polynomial is used; for pchip a 4th order polynomial is used. PChip is similar to a spline interpolation but it avoids the overshoot and undershoot that plagues splines.

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