NAME: sinterp4 PURPOSE: (one line) Four-fold sinc interpolation of a vector of data. DESCRIPTION: This function will do a 4-fold sinc interpolation of the data array that is passed. CATEGORY: Numerical CALLING SEQUENCE: result = sinterp4( x ) INPUTS: x : Input data array. OPTIONAL INPUT PARAMETERS: KEYWORD PARAMETERS: OUTPUTS: The interpolated array is returned as the function value. COMMON BLOCKS: SIDE EFFECTS: RESTRICTIONS: PROCEDURE: MODIFICATION HISTORY: Original C-Language version written by: Marc W. Buie, Institute for Astronomy, University of Hawaii. Date: 9 December 1987. Adapted for IDL by Doug Loucks, Lowell Observatory, September 2, 1993.