utilities.c File Reference

#include "ssht/ssht.h"
#include "utilities.h"
#include <complex.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

Include dependency graph for utilities.c:

Functions
int	null_test (const complex double *X, int n)
int	nan_test (const complex double *X, int n)
void	gen_flm_real (complex double *flm, int L, int seed)
void	gen_lb_flm_real (complex double *flm, int L0, int L, int seed)
void	gen_flm_complex (complex double *flm, int L, int spin, int seed)
int	max (int a, int b)
void	gen_lb_flm_complex (complex double *flm, int L0, int L, int spin, int seed)
double	ran2_dp (int idum)

Function Documentation

gen_flm_complex()

void gen_flm_complex	(	complex double *	flm,
		int	L,
		int	spin,
		int	seed
	)

Generate random spherical harmonic coefficients of a complex signal.

Parameters

[out]	flm	Random spherical harmonic coefficients generated.
[in]	L	Harmonic band-limit.
[in]	spin	Spin number.
[in]	seed	Integer seed required for random number generator.

Return values

none

Author

Jason McEwen

gen_flm_real()

void gen_flm_real	(	complex double *	flm,
		int	L,
		int	seed
	)

Generate random spherical harmonic coefficients of a real spin=0 signal.

Parameters

[out]	flm	Random spherical harmonic coefficients generated.
[in]	L	Harmonic band-limit.
[in]	seed	Integer seed required for random number generator.

Return values

none

Author

Jason McEwen

gen_lb_flm_complex()

void gen_lb_flm_complex	(	complex double *	flm,
		int	L0,
		int	L,
		int	spin,
		int	seed
	)

Generate random spherical harmonic coefficients of a complex signal with lower band-limit.

Parameters

[out]	flm	Random spherical harmonic coefficients generated.
[in]	L0	Lower harmonic band-limit.
[in]	L	Upper harmonic band-limit.
[in]	spin	Spin number.
[in]	seed	Integer seed required for random number generator.

Return values

none

Author

Jason McEwen

gen_lb_flm_real()

void gen_lb_flm_real	(	complex double *	flm,
		int	L0,
		int	L,
		int	seed
	)

Generate random spherical harmonic coefficients of a real spin=0 signal with lower band-limit.

Parameters

[out]	flm	Random spherical harmonic coefficients generated.
[in]	L0	Lower harmonic band-limit.
[in]	L	Upper harmonic band-limit.
[in]	seed	Integer seed required for random number generator.

Return values

none

Author

Jason McEwen

max()

int max	(	int	a,
		int	b
	)

nan_test()

int nan_test	(	const complex double *	X,
		int	n
	)

Test for nan vector

Parameters

[in]	X	vector of complex double
[in]	n	length of X.

Return values

Y	returns int 1 if no nans, 0 if nan entires exist. i.e. 0 = fail, 1 = pass.

null_test()

int null_test	(	const complex double *	X,
		int	n
	)

Test for null vector

Parameters

[in]	X	vector of complex double
[in]	n	length of X.

Return values

Y	returns int 0 if all zeros, 1 if non-zero i.e. 0 = fail, 1 = pass.

ran2_dp()

double ran2_dp

(

int

idum

)

Generate uniform deviate in range [0,1) given seed. (Using double precision.)

Note

Uniform deviate (Num rec 1992, chap 7.1), original routine said to be 'perfect'.

Parameters

[in]

idum

Seed.

Return values

ran_dp

Generated uniform deviate.

Author

Jason McEwen