pprz_stat.c File Reference

Statistics functions. More...

#include "math/pprz_stat.h"

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Functions
int32_t	mean_i (int32_t *array, uint32_t n_elements)
	Compute the mean value of an array This is implemented using floats to handle scaling of all variables. More...
int32_t	variance_i (int32_t *array, uint32_t n_elements)
	Compute the variance of an array of values (integer). More...
int32_t	covariance_i (int32_t *array1, int32_t *array2, uint32_t n_elements)
	Compute the covariance of two arrays V(X) = E[(X-E[X])(Y-E[Y])] = E[XY] - E[X]E[Y] where E[X] is the expected value of X This is implemented using floats to handle scaling of all variables. More...
float	sum_f (float *array, uint32_t n_elements)
	Compute the sum array elements (float) More...
float	mean_f (float *array, uint32_t n_elements)
	Compute the mean value of an array (float) More...
float	variance_f (float *array, uint32_t n_elements)
	Compute the variance of an array of values (float). More...
float	covariance_f (float *arr1, float *arr2, uint32_t n_elements)
	Compute the covariance of two arrays V(X) = E[(X-E[X])(Y-E[Y])] = E[XY] - E[X]E[Y] where E[X] is the expected value of X. More...

Detailed Description

Statistics functions.

Definition in file pprz_stat.c.

Function Documentation

covariance_f()

float covariance_f	(	float *	arr1,
		float *	arr2,
		uint32_t	n_elements
	)

Compute the covariance of two arrays V(X) = E[(X-E[X])(Y-E[Y])] = E[XY] - E[X]E[Y] where E[X] is the expected value of X.

Parameters

[in]	*array1	The first array
[in]	*array2	The second array
[in]	n_elements	Number of elements in the arrays

Returns

covariance

Definition at line 152 of file pprz_stat.c.

Referenced by set_cov_div(), set_cov_flow(), and variance_f().

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covariance_i()

int32_t covariance_i	(	int32_t *	array1,
		int32_t *	array2,
		uint32_t	n_elements
	)

Compute the covariance of two arrays V(X) = E[(X-E[X])(Y-E[Y])] = E[XY] - E[X]E[Y] where E[X] is the expected value of X This is implemented using floats to handle scaling of all variables.

Parameters

[in]	*array1	The first array
[in]	*array2	The second array
[in]	n_elements	Number of elements in the arrays

Returns

covariance

Definition at line 78 of file pprz_stat.c.

Referenced by variance_i().

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mean_f()

float mean_f	(	float *	array,
		uint32_t	n_elements
	)

Compute the mean value of an array (float)

Parameters

[in]	*array	The array
[in]	n_elements	Number of elements in the array

Returns

mean

Definition at line 122 of file pprz_stat.c.

References array, and sum_f().

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mean_i()

int32_t mean_i	(	int32_t *	array,
		uint32_t	n_elements
	)

Compute the mean value of an array This is implemented using floats to handle scaling of all variables.

Parameters

[in]	*array	The array
[in]	n_elements	Number of elements in the array

Returns

mean

Definition at line 39 of file pprz_stat.c.

References array.

sum_f()

float sum_f	(	float *	array,
		uint32_t	n_elements
	)

Compute the sum array elements (float)

Compute the sum array elements.

Parameters

[in]	*array	The array
[in]	n_elements	Number of elements in the arrays

Returns

array sum

Definition at line 106 of file pprz_stat.c.

References array.

Referenced by mean_f().

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variance_f()

float variance_f	(	float *	array,
		uint32_t	n_elements
	)

Compute the variance of an array of values (float).

The variance is a measure of how far a set of numbers is spread out V(X) = E[(X-E[X])^2] = E[X^2] - E[X]^2 where E[X] is the expected value of X

Parameters

array	Pointer to an array of float
n_elements	Number of values in the array

Returns

variance

Definition at line 139 of file pprz_stat.c.

References array, and covariance_f().

Referenced by baro_cb().

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variance_i()

int32_t variance_i	(	int32_t *	array,
		uint32_t	n_elements
	)

Compute the variance of an array of values (integer).

The variance is a measure of how far a set of numbers is spread out V(X) = E[(X-E[X])^2] = E[X^2] - E[X]^2 where E[X] is the expected value of X This is implemented using floats to handle scaling of all variables

Parameters

array	pointer to an array of integer
n_elements	number of elements in the array

Returns

variance

Definition at line 64 of file pprz_stat.c.

References array, and covariance_i().

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