saf_utility_misc.c File Reference

A collection of miscellaneous functions. More...

#include "saf_utilities.h"
#include "saf_externals.h"

Go to the source code of this file.

Functions
static void	combinationUtil (int *arr, int *data, int start, int end, int index, int r, int **comb, int *nComb)
	Helper function for findCombinations()
void	convert_0_360To_m180_180 (float *dirs_deg, int nDirs)
	Wraps around any angles exeeding 180 degrees (e.g., 200-> -160)
int	nextpow2 (int numsamp)
	A simple function which returns the next power of 2.
void	lagrangeWeights (int N, float *x, int len_x, float *weights)
	Computes Lagrange interpolation weights of order 'N' for value 'x'.
void	findERBpartitions (float *centerFreq, int nBands, float maxFreqLim, int **erb_idx, float **erb_freqs, int *nERBBands)
	This function takes a frequency vector and groups its frequencies into critical bands [Equivalent-Rectangular Bandwidth (ERB)].
void	randperm (int len, int *randperm)
	Returns the indices required to randomly permute a vector of length 'len'.
long double	factorial (int n)
	Factorial, accurate up to n<=25.
float	matlab_fmodf (float x, float y)
	C fmodf function, except it behaves like 'mod' in Matlab (i.e.
void	cxcorr (float *a, float *b, float *x_ab, size_t la, size_t lb)
	Calculates the cross correlation between two vectors.
void	rand_m1_1 (float *vector, int length)
	Generates random numbers between -1 and 1 and stores them in the input vector.
void	rand_cmplx_m1_1 (float_complex *vector, int length)
	Generates random numbers between -1 and 1 and stores them in the input vector for both the real and imaginary parts.
void	rand_0_1 (float *vector, int length)
	Generates random numbers between 0 and 1 and stores them in the input vector.
void	convd (double *x, double *h, int len_x, int len_h, double *y)
	Basic 1-D direct convolution in the time-domain (real double precision)
void	convz (double_complex *x, double_complex *h, int len_x, int len_h, double_complex *y)
	Basic 1-D direct convolution in the time-domain (complex double precision)
void	polyd_v (double *x, double *poly, int len_x)
	Convert roots of a vector to polynomial (real double precision)
void	polyz_v (double_complex *x, double_complex *poly, int len_x)
	Convert roots of a vector to polynomial (complex double precision)
void	polyd_m (double *X, double_complex *poly, int size_x)
	Convert roots of a matrix to polynomial (real double precision)
float	sumf (float *values, int nValues)
	Returns the sum of all values.
int	anyLessThanf (float *values, int nValues, float threshold)
	Returns 1, if any value in 'values' (nValues x 1) is less than 'threshold', otherwise, it returns 0.
void	unique_i (int *input, int nInputs, int **uniqueVals, int **uniqueInds, int *nUnique)
	Finds the unique values (and their indices) of the input vector.
void	findCombinations (int *arrValues, int nValues, int nElements, int **comb, int *nComb)
	Given an array of values, find all the possible combinations (nCr) for subgroups of "nElements"; derived based on [1].
void	gexpm (float *D, int sizeD, int m1, float *Y)
	Numerically solves first-order, linear, homogeneous differential equation systems, with non-constant coefficients, by generalization of the Pade- approximant method for exponential matrices.

Variables
static const long double	factorials_21 [21]
	Precomputed factorials for up to !21 (i.e.

Detailed Description

A collection of miscellaneous functions.

Author

Leo McCormack

Date

29.01.2020

License

ISC

Definition in file saf_utility_misc.c.

Function Documentation

combinationUtil()

static void combinationUtil ( int * arr, int * data, int start, int end, int index, int r, int ** comb, int * nComb )

static

Helper function for findCombinations()

Definition at line 37 of file saf_utility_misc.c.

Variable Documentation

factorials_21

const long double factorials_21[21]

static

Initial value:

=
{1.0, 1.0, 2.0, 6.0, 24.0, 120.0, 720.0, 5040.0, 40320.0, 362880.0, 3628800.0, 39916800.0, 479001600.0, 6.2270208e9, 8.71782891e10, 1.307674368000000e12, 2.092278988800000e13, 3.556874280960000e14, 6.402373705728000e15, 1.216451004088320e17, 2.432902008176640e18}

Precomputed factorials for up to !21 (i.e.

the "getSH" functions will employ these up to 10th order)

Definition at line 33 of file saf_utility_misc.c.