Call from fortran without the trailing '_'. More...

Functions
void	shtns_verbose_ (int *v)
	Set verbosity level.

void	shtns_use_threads_ (int *num_threads)
	Enable threads.

void	shtns_print_cfg_ ()
	Print info.

void	shtns_init_sh_gauss_ (int layout, int lmax, int mmax, int mres, int nlat, int nphi)
	Initializes spherical harmonic transforms of given size using Gauss algorithm with default polar optimization.

void	shtns_init_sh_auto_ (int layout, int lmax, int mmax, int mres, int nlat, int nphi)
	Initializes spherical harmonic transforms of given size using Fastest available algorithm and polar optimization.

void	shtns_init_sh_reg_fast_ (int layout, int lmax, int mmax, int mres, int nlat, int nphi)
	Initializes spherical harmonic transforms of given size using a regular grid and agressive optimizations.

void	shtns_init_sh_poles_ (int layout, int lmax, int mmax, int mres, int nlat, int nphi)
	Initializes spherical harmonic transform SYNTHESIS ONLY of given size using a regular grid including poles.

void	shtns_set_size_ (int lmax, int mmax, int mres, int norm)
	Defines the size and convention of the transform. More...

void	shtns_precompute_ (int type, int layout, double eps, int nlat, int *nphi)
	Precompute matrices for synthesis and analysis. More...

void	shtns_precompute_auto_ (int type, int layout, double eps, int nl_order, int nlat, int nphi)
	Same as shtns_precompute_ but choose optimal nlat and/or nphi. More...

void	shtns_reset_ ()
	Clear everything.

void	shtns_calc_nlm_ (int nlm, const int const lmax, const int const mmax, const int const mres)
	returns nlm, the number of complex*16 elements in an SH array. More...

void	shtns_lmidx_ (int lm, const int const l, const int *const m)
	returns lm, the index in an SH array of mode (l,m). More...

void	shtns_l_m_ (int l, int m, const int *const lm)
	returns l and m, degree and order of an index in SH array lm. More...

void	shtns_cos_array_ (double *costh)
	fills the given array with the cosine of the co-latitude angle (NLAT real*8) if no grid has been set, the first element will be set to zero. More...

void	shtns_gauss_wts_ (double *wts)
	fills the given array with the gaussian quadrature weights ((NLAT+1)/2 real*8). More...

Point evaluation of Spherical Harmonics
Evaluate at a given point ( $cos(\theta)$ and $\phi$ ) a spherical harmonic representation.
void	shtns_sh_to_point_ (double spat, cplx Qlm, double cost, double phi)

void	shtns_qst_to_point_ (double vr, double vt, double vp, cplx Qlm, cplx Slm, cplx Tlm, double cost, double phi)

Detailed Description

Call from fortran without the trailing '_'.

see the Fortran example for a simple usage of SHTns from Fortran language.

Function Documentation

void shtns_calc_nlm_	(	int *	nlm,
		const int *const	lmax,
		const int *const	mmax,
		const int *const	mres
	)

returns nlm, the number of complex*16 elements in an SH array.

call from fortran using

call shtns_calc_nlm(nlm, lmax, mmax, mres)

void shtns_cos_array_ ( double * costh )

fills the given array with the cosine of the co-latitude angle (NLAT real*8) if no grid has been set, the first element will be set to zero.

void shtns_gauss_wts_ ( double * wts )

fills the given array with the gaussian quadrature weights ((NLAT+1)/2 real*8).

when there is no gaussian grid, the first element is set to zero.

void shtns_l_m_	(	int *	l,
		int *	m,
		const int *const	lm
	)

returns l and m, degree and order of an index in SH array lm.

call from fortran using

call shtns_l_m(l, m, lm)

void shtns_lmidx_	(	int *	lm,
		const int *const	l,
		const int *const	m
	)

returns lm, the index in an SH array of mode (l,m).

call from fortran using

call shtns_lmidx(lm, l, m)

void shtns_precompute_	(	int *	type,
		int *	layout,
		double *	eps,
		int *	nlat,
		int *	nphi
	)

Precompute matrices for synthesis and analysis.

Allow to choose polar optimization threshold and algorithm type.

See Also: shtns_set_grid

void shtns_precompute_auto_	(	int *	type,
		int *	layout,
		double *	eps,
		int *	nl_order,
		int *	nlat,
		int *	nphi
	)

Same as shtns_precompute_ but choose optimal nlat and/or nphi.

See Also: shtns_set_grid_auto

void shtns_qst_to_point_	(	double *	vr,
		double *	vt,
		double *	vp,
		cplx *	Qlm,
		cplx *	Slm,
		cplx *	Tlm,
		double *	cost,
		double *	phi
	)

See Also: SHqst_to_point for argument description

void shtns_set_size_	(	int *	lmax,
		int *	mmax,
		int *	mres,
		int *	norm
	)

Defines the size and convention of the transform.

Allow to choose the normalization and whether or not to include the Condon-Shortley phase.

See Also: shtns_create

void shtns_sh_to_point_	(	double *	spat,
		cplx *	Qlm,
		double *	cost,
		double *	phi
	)

See Also: SH_to_point for argument description

Functions

Point evaluation of Spherical Harmonics

Detailed Description

Function Documentation