c_ftcurvi - calculate integrals

       To use c_ftcurvi, 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_ftcurvi(3NCARG)

       xl          The lower limit of the integration.

       xr          The upper limit of the integration.

       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).

       integral    The integral of the function from xl to xr is given by *integral.

       int c_ftcurvi (float, float, int, float [], float [], float *);

       c_ftcurvi - calculate integrals

       c_ftcurvi 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_ftcurvi (xl, xr, n, xi, yi, integral);

       c_ftcurvi  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_ftcurvi are: sig, sl1,  sln,
       sf1.