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TriLookup 2.21

TriLookup
Excel add-in with eleven powerful worksheet functions for 1, 2 and 3 variable lookup and interpolation. Interpolation modes include: closest-value, linear, piecewise parabolic or hyperbolic, cubic spline and polynomial up to 20th order. The functions can also handle tables containing missing and invalid data.

Includes functions to fit polynomial curves through a set of X-Y data points and return a table of polynomial curve coefficients, as...