qmckl/org/qmckl_jastrow.org

Jastrow Factor

• Context
  • Data structure

Functions for the calculation of the Jastrow factor \(f_{ee}, f_{en}, f_{een}\). These are stored in the factor_ee, factor_en, and factor_een variables. The jastrow structure contains all the information required to build these factors along with their derivatives.

Context

The following data stored in the context:

int32_t	uninitialized	in	Keeps bit set for uninitialized data
int64_t	aord_num	in	The number of a coeffecients
int64_t	bord_num	in	The number of b coeffecients
int64_t	cord_num	in	The number of c coeffecients
uint64_t	type_nuc_num	in	Number of Nucleii types
uint64_t	dim_cord_vec	in	Number of unique C coefficients
double	aord_vector[aord_num + 1][type_nuc_num]	in	Order of a polynomial coefficients
double	bord_vector[bord_num + 1]	in	Order of b polynomial coefficients
double	cord_vector[cord_num][type_nuc_num]	in	Order of c polynomial coefficients
double	factor_ee	out	Jastrow factor: electron-electron part
double	factor_en	out	Jastrow factor: electron-nucleus part
double	factor_een	out	Jastrow factor: electron-electron-nucleus part
double	factor_ee_deriv_e[4][nelec]	out	Derivative of the Jastrow factor: electron-electron-nucleus part
double	factor_en_deriv_e[4][nelec]	out	Derivative of the Jastrow factor: electron-electron-nucleus part
double	factor_een_deriv_e[4][nelec]	out	Derivative of the Jastrow factor: electron-electron-nucleus part

computed data:

coord_vect_full	[dim_cord_vec]	vector of non-zero coefficients
tmp_c	[elec_num][nuc_num][ncord + 1][ncord]	vector of non-zero coefficients
dtmp_c	[elec_num][4][nuc_num][ncord + 1][ncord]	vector of non-zero coefficients

Data structure

qmckl_exit_code qmckl_jastrow (
const int32_t uninitialized,
const int64_t aord_num,
const int64_t bord_num,
const int64_t cord_num,
const uint64_t type_nuc_num,
const uint64_t dim_cord_vec,
const double* aord_vector,
const double* bord_vector,
const double* cord_vector,
double* const factor_ee,
double* const factor_en,
double* const factor_een,
double* const factor_ee_deriv_e,
double* const factor_en_deriv_e,
double* const factor_een_deriv_e );

The uninitialized integer contains one bit set to one for each initialization function which has not been called. It becomes equal to zero after all initialization functions have been called. The struct is then initialized and provided == true. Some values are initialized by default, and are not concerned by this mechanism.

qmckl_exit_code qmckl_init_jastrow(qmckl_context context);

qmckl_exit_code qmckl_init_jastrow(qmckl_context context) {

if (qmckl_context_check(context) == QMCKL_NULL_CONTEXT) {
 return false;
}

qmckl_context_struct* const ctx = (qmckl_context_struct* const) context;
assert (ctx != NULL);

ctx->jastrow.uninitialized = (1 << 2) - 1;

/* Default values */
ctx->jastrow.rescale_factor_kappa_ee = 1.0;
ctx->jastrow.rescale_factor_kappa_en = 1.0;

return QMCKL_SUCCESS;
}

bool qmckl_jastrow_provided (const qmckl_context context);