c_ftcurvp - 1D interpolation for periodic functions

       To use c_ftcurvp, load the NCAR Graphics library ngmath.

       Copyright (C) 2000
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.

UNIX                                               March 1998                                  c_ftcurvp(3NCARG)

       n           The number of input data points. (n > 1)

       xi          An array containing the abscissae for the input function.

       yi          An  array  containing  the  input functional values (y(k) is the functional value at x(k) for
                   k=0,n).

       p           The period of the function; p must not be less than xi[n-1] - xi[0].

       m           The number of desired interpolated points.

       xo          An array containing the abscissae for the interpolated values.

       yo          An array containing the interpolated functional values (yo(k)  is  the  functional  value  at
                   xo(k) for k=0,n).

       int c_ftcurvp (int, float [], float [], float, int, float [], float []);

       c_ftcurvp - 1D interpolation for periodic functions

       c_ftcurvp returns an error value as per:

       = 0 -- no error.
       = 1 -- if n is less than 2.
       = 2 -- if the period is strictly less than the span of the abscissae.

       fitgrid_params, c_ftseti, c_ftsetr, c_ftsetc.

       Complete documentation for Fitgrid is available at URL
       http://ngwww.ucar.edu/ngdoc/ng/ngmath/fitgrid/fithome.html

       int c_ftcurvp (n, xi, yi, p, m, xo, yo);

       c_ftcurvp  is  called  after  all  of  the  desired values for control parameters have been set using the
       procedures c_ftseti, c_ftsetr, c_ftsetc.  Control parameters that apply to c_ftcurvp are: sig.