gradient.c File Reference

Gradient computation. More...

#include <grass/raster3d.h>

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Functions
void	Rast3d_gradient_double (RASTER3D_Array_double *array, double *step, RASTER3D_Array_double *grad_x, RASTER3D_Array_double *grad_y, RASTER3D_Array_double *grad_z)
	Gradient computation.

Detailed Description

Gradient computation.

SPDX-FileCopyrightText: 2014 GRASS Development Team SPDX-License-Identifier: GPL-2.0-or-later

Author

Anna Petrasova

Definition in file gradient.c.

Function Documentation

Rast3d_gradient_double()

void Rast3d_gradient_double	(	RASTER3D_Array_double *	array,
		double *	step,
		RASTER3D_Array_double *	grad_x,
		RASTER3D_Array_double *	grad_y,
		RASTER3D_Array_double *	grad_z
	)

Gradient computation.

Gradient computation (second order approximation) using central differencing scheme (plus forward and backward difference of second order approximation). When one or more of the cells, from which the gradient for a particular cell is computed, is null, gradient for that particular cell is set to 0.

Parameters

	array	pointer to RASTER3D_Array with input values
	step	array of x, y, z steps for gradient (resolution values)
[out]	grad_x	pointer to RASTER3D_Array_double with gradient in x direction
[out]	grad_y	pointer to RASTER3D_Array_double with gradient in y direction
[out]	grad_z	pointer to RASTER3D_Array_double with gradient in z direction

Definition at line 31 of file gradient.c.

References DCELL_TYPE, Rast_is_d_null_value, Rast_set_null_value(), RASTER3D_ARRAY_ACCESS, RASTER3D_Array_double::sx, RASTER3D_Array_double::sy, and RASTER3D_Array_double::sz.