Provided by: libncarg-dev_6.6.2.dfsg.1-1_amd64
NAME
CURV2 - 1D interpolation for non-periodic functions.
SYNOPSIS
FUNCTION CURV2 (T, N, X, Y, YP, SIGMA) This function interpolates a value at a specified point using a spline under tension. CURV1 must be called prior to calling CURV2, and the values thus obtained used as input to CURV2. CURV2 returns the interpolated function value at the X-coordinate specified.
DESCRIPTION
T (real, input) The abscissa for which an interpolated function value is desired. N (integer, input) The number of input data values. (N > 1) X (real, input) An array containing the abscissae for the input function. Y (real, input) An array containing the functional values of the input data -- Y(K) is the functional value at X(K) for K=1,N. YP (real, input) Contains values for the second derivative (as calculated by CURV1). SIGMA (real, input) Tension factor. Values near zero result in a cubic spline; large values (e.g. 50) result in nearly a polygonal line. A typical value is 1.
RETURN VALUE
CURV2 returns the interpolated value at the specified point T.
ACCESS
To use CURV2, load the NCAR Graphics library ngmath.
SEE ALSO
curv1, fitgrid_params. Complete documentation for Fitgrid is available at URL http://ngwww.ucar.edu/ngdoc/ng/ngmath/fitgrid/fithome.html
COPYRIGHT
Copyright (C) 2000 University Corporation for Atmospheric Research The use of this Software is governed by a License Agreement.