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The INTEPOLATE2 function is used exactly like the INTERPOLATE function.  The only difference is that INTERPOLATE2 uses quadratic interpolation whereas the INTERPOLATE function uses cubic interpolation.  A warning message will be generated if the Interpolate2 command attempts to extrapolate data  Warnings will not be visible unless the Display Warning Messages control in the Options tab of the Preferences dialog is checked.


See also:  INTERPOLATE, INTERPOLATE1, Mathematical Functions