n_tools.c File Reference

#include <math.h>
#include <grass/N_pde.h>
#include <grass/glocale.h>

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Functions
double	N_calc_arith_mean (double a, double b)
	Calculate the arithmetic mean of values a and b. More...
double	N_calc_arith_mean_n (double *a, int size)
	Calculate the arithmetic mean of the values in vector a of size n. More...
double	N_calc_geom_mean (double a, double b)
	Calculate the geometrical mean of values a and b. More...
double	N_calc_geom_mean_n (double *a, int size)
	Calculate the geometrical mean of the values in vector a of size n. More...
double	N_calc_harmonic_mean (double a, double b)
	Calculate the harmonical mean of values a and b. More...
double	N_calc_harmonic_mean_n (double *a, int size)
	Calculate the harmonical mean of the values in vector a of size n. More...
double	N_calc_quad_mean (double a, double b)
	Calculate the quadratic mean of values a and b. More...
double	N_calc_quad_mean_n (double *a, int size)
	Calculate the quadratic mean of the values in vector a of size n. More...

Function Documentation

N_calc_arith_mean()

double N_calc_arith_mean	(	double	a,
		double	b
	)

Calculate the arithmetic mean of values a and b.

mean = (a+b)/2

Parameters

a	double
b	double

Returns

val double

Definition at line 33 of file n_tools.c.

N_calc_arith_mean_n()

double N_calc_arith_mean_n	(	double *	a,
		int	size
	)

Calculate the arithmetic mean of the values in vector a of size n.

n = [0 ... size[ mean = (a[0] + a[1] + ... + a[n])/size

Parameters

a	double * – the value vector
size	int – the size of the vector a

Returns

val double

Definition at line 53 of file n_tools.c.

N_calc_geom_mean()

double N_calc_geom_mean	(	double	a,
		double	b
	)

Calculate the geometrical mean of values a and b.

mean = sqrt(a*b)

Parameters

a	double
b	double

Returns

val double

Definition at line 76 of file n_tools.c.

N_calc_geom_mean_n()

double N_calc_geom_mean_n	(	double *	a,
		int	size
	)

Calculate the geometrical mean of the values in vector a of size n.

n = [0 ... size[ mean = pow((a[0] * a[1] * ... * a[n]), 1.0/size)

Parameters

a	double * – the value vector
size	int – the size of the vector a

Returns

val double

Definition at line 96 of file n_tools.c.

N_calc_harmonic_mean()

double N_calc_harmonic_mean	(	double	a,
		double	b
	)

Calculate the harmonical mean of values a and b.

mean = 2*(a*b)/(a + b)

Parameters

a	double
b	double

Returns

val double – if (a + b) == 0, a 0 is returned

Definition at line 119 of file n_tools.c.

Referenced by N_compute_gradient_field_2d(), and N_compute_gradient_field_3d().

N_calc_harmonic_mean_n()

double N_calc_harmonic_mean_n	(	double *	a,
		int	size
	)

Calculate the harmonical mean of the values in vector a of size n.

n = [0 ... size[ mean = 1/(1/size *(1/a[0] + 1/a[1] + ... + 1/a[n]))

Parameters

a	double * – the value vector
size	int – the size of the vector a

Returns

val double – if one division with 0 is detected, 0 will be returned

Definition at line 140 of file n_tools.c.

N_calc_quad_mean()

double N_calc_quad_mean	(	double	a,
		double	b
	)

Calculate the quadratic mean of values a and b.

mean = sqrt((a*a + b*b)/2)

Parameters

a	double
b	double

Returns

val double

Definition at line 169 of file n_tools.c.

N_calc_quad_mean_n()

double N_calc_quad_mean_n	(	double *	a,
		int	size
	)

Calculate the quadratic mean of the values in vector a of size n.

n = [0 ... size[ mean = sqrt((a[0]*a[0] + a[1]*a[1] + ... + a[n]*a[n])/size)

Parameters

a	double * – the value vector
size	int – the size of the vector a

Returns

val double

Definition at line 189 of file n_tools.c.