func2d.c File Reference

#include <stdio.h>
#include <math.h>
#include <grass/gis.h>
#include <grass/interpf.h>

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Functions
double	IL_crst (double r, double fi)
	Radial basis function.
int	IL_crstg (double r, double fi, double *gd1, double *gd2)
	Function for calculating derivatives (d=2)

Detailed Description

Author

Lubos Mitas (original program and various modifications)

H. Mitasova, I. Kosinovsky, D. Gerdes, D. McCauley (GRASS4.1 version of the program and GRASS4.2 modifications)

L. Mitas , H. Mitasova , I. Kosinovsky, D.Gerdes D. McCauley (1993, 1995)

modified by McCauley in August 1995

modified by Mitasova in August 1995, Nov. 1996

Copyright

(C) 1993-1999 by Lubos Mitas and the GRASS Development Team

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Definition in file func2d.c.

Function Documentation

IL_crst()

double IL_crst	(	double	r,
		double	fi
	)

Radial basis function.

Radial basis function - completely regularized spline with tension (d=2)

parameter description from DESCRIPTION.INTERP

Parameters

r	distance squared
fi	tension

Returns

Definition at line 49 of file func2d.c.

References b, r, and x.

IL_crstg()

int IL_crstg	(	double	r,
		double	fi,
		double *	gd1,
		double *	gd2
	)

Function for calculating derivatives (d=2)

Derivatives of radial basis function - regularized spline with tension(d=2)

Parameters

r	distance squared
fi	tension
gd1	G1(r)
gd2	G2(r)

Returns

Definition at line 111 of file func2d.c.

References r, and x.