vectors.c File Reference

#include <errno.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <zsl/vectors.h>
#include <zsl/zsl.h>

Go to the source code of this file.

Functions
int	zsl_vec_init (struct zsl_vec *v)
int	zsl_vec_from_arr (struct zsl_vec *v, zsl_real_t *a)
	Converts an array of values into a vector. The number of elements in array 'a' must match the number of elements in vector 'v'. As such, 'v' should be previously initialised with an appropriate value assigned to v.sz. More...
int	zsl_vec_copy (struct zsl_vec *vdest, struct zsl_vec *vsrc)
	Copies the contents of vector 'vsrc' into vector 'vdest'. More...
int	zsl_vec_get_subset (struct zsl_vec *v, size_t offset, size_t len, struct zsl_vec *vsub)
	Returns a subset of source vector 'v' in 'vsub'.. More...
int	zsl_vec_add (struct zsl_vec *v, struct zsl_vec *w, struct zsl_vec *x)
	Adds corresponding vector elements in 'v' and 'w', saving to 'x'. More...
int	zsl_vec_sub (struct zsl_vec *v, struct zsl_vec *w, struct zsl_vec *x)
	Subtracts corresponding vector elements in 'v' and 'w', saving to 'x'. More...
int	zsl_vec_neg (struct zsl_vec *v)
	Negates the elements in vector 'v'. More...
int	zsl_vec_sum (struct zsl_vec **v, size_t n, struct zsl_vec *w)
	Component-wise sum of a set of equal-length vectors. More...
int	zsl_vec_scalar_add (struct zsl_vec *v, zsl_real_t s)
	Adds a scalar to each element in a vector. More...
int	zsl_vec_scalar_mult (struct zsl_vec *v, zsl_real_t s)
	Multiply a vector by a scalar. More...
int	zsl_vec_scalar_div (struct zsl_vec *v, zsl_real_t s)
	Divide a vector by a scalar. More...
zsl_real_t	zsl_vec_dist (struct zsl_vec *v, struct zsl_vec *w)
	Calculates the distance between two vectors, which is equal to the norm of vector v - vector w. More...
int	zsl_vec_dot (struct zsl_vec *v, struct zsl_vec *w, zsl_real_t *d)
	Computes the dot (aka scalar) product of two equal-length vectors (the sum of their component-wise products). The dot product is an indicator of the "agreement" between two vectors, or can be used to determine how far vector w deviates from vector v. More...
zsl_real_t	zsl_vec_norm (struct zsl_vec *v)
	Calculates the norm or absolute value of vector 'v' (the square root of the vector's dot product). More...
int	zsl_vec_project (struct zsl_vec *u, struct zsl_vec *v, struct zsl_vec *w)
	Calculates the projection of vector 'u' over vector 'v', placing the results in vector 'w'. More...
int	zsl_vec_to_unit (struct zsl_vec *v)
	Converts (normalises) vector 'v' to a unit vector (a vector of magnitude or length 1). This is accomploished by dividing each element by the it's norm. More...
int	zsl_vec_cross (struct zsl_vec *v, struct zsl_vec *w, struct zsl_vec *c)
	Computes the cross (or vector) product of two 3-vectors. More...
zsl_real_t	zsl_vec_sum_of_sqrs (struct zsl_vec *v)
	Computes the vector's sum of squares. More...
int	zsl_vec_mean (struct zsl_vec **v, size_t n, struct zsl_vec *m)
	Computes the component-wise mean of a set of identically-sized vectors. More...
int	zsl_vec_ar_mean (struct zsl_vec *v, zsl_real_t *m)
	Computes the arithmetic mean of a vector. More...
int	zsl_vec_rev (struct zsl_vec *v)
	Reverses the order of the entries in vector 'v'. More...
int	zsl_vec_zte (struct zsl_vec *v)
	Rearranges the input vector to place any zero-values at the end. More...
bool	zsl_vec_is_equal (struct zsl_vec *v, struct zsl_vec *w, zsl_real_t eps)
	Checks if two vectors are identical in size and content. More...
bool	zsl_vec_is_nonneg (struct zsl_vec *v)
	Checks if all elements in vector v are >= zero. More...
int	zsl_vec_contains (struct zsl_vec *v, zsl_real_t val, zsl_real_t eps)
	Checks if vector v contains val, returning the number of occurences. More...
int	zsl_vec_sort (struct zsl_vec *v, struct zsl_vec *w)
	Sorts the values in vector v from smallest to largest using quicksort, and assigns the sorted output to vector w. More...
int	zsl_vec_print (struct zsl_vec *v)
	Print the supplied vector using printf in a human-readable manner. More...