c_ftcurvd - calculate derivatives

       To use c_ftcurvd, 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_ftcurvd(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  functional values of the input function -- y(k) is the functional
                   value at x(k) for k=0,n.

       m           The number of desired derivatives.

       xo          An array containing the abscissae for the output values.

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

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

       c_ftcurvd - calculate derivatives

       c_ftcurvd returns an error value as per:

       = 0 -- no error.
       = 1 -- if n is less than 2.
       = 2 -- if X values are not strictly increasing.

       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_ftcurvd (n, xi, yi, m, xo, yo);

       c_ftcurvd  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_ftcurvd are: sig, sl1,  sln,
       sf1.