cube_utils Module Reference

for a given dr()/dh(r) this will provide the bounds to be used if one wants to go over a sphere-subregion of given radius More...

Data Types
type	cube_info_type

Functions/Subroutines
subroutine, public	compute_cube_center (cube_center, rs_desc, zeta, zetb, ra, rab)
	unifies the computation of the cube center, so that differences in implementation, and thus roundoff and numerics can not lead to off-by-one errors (which can lead to out-of-bounds access with distributed grids). in principle, something similar would be needed for the computation of the cube bounds
subroutine, public	return_cube_nonortho (info, radius, lb, ub, rp)
	...
subroutine, public	return_cube (info, radius, lb_cube, ub_cube, sphere_bounds)
	...
integer function, public	return_cube_max_iradius (info)
	...
subroutine, public	destroy_cube_info (info)
	...
subroutine, public	init_cube_info (info, dr, dh, dh_inv, ortho, max_radius)
	...

Detailed Description

for a given dr()/dh(r) this will provide the bounds to be used if one wants to go over a sphere-subregion of given radius

Note

the computation of the exact sphere radius is sensitive to roundoff (e.g. compiler optimization level) and hence this small roundoff can result in energy difference of about EPS_DEFAULT in QS energies (one gridpoint more or less in the density mapping)

Author

Joost VandeVondele

Function/Subroutine Documentation

compute_cube_center()

subroutine, public cube_utils::compute_cube_center	(	integer, dimension(3), intent(out)	cube_center,
		type(realspace_grid_desc_type), pointer	rs_desc,
		real(kind=dp), intent(in)	zeta,
		real(kind=dp), intent(in)	zetb,
		real(kind=dp), dimension(3), intent(in)	ra,
		real(kind=dp), dimension(3), intent(in)	rab
	)

unifies the computation of the cube center, so that differences in implementation, and thus roundoff and numerics can not lead to off-by-one errors (which can lead to out-of-bounds access with distributed grids). in principle, something similar would be needed for the computation of the cube bounds

Parameters

cube_center	...
rs_desc	...
zeta	...
zetb	...
ra	...
rab	...

History

11.2008 created [Joost VandeVondele]

Definition at line 67 of file cube_utils.F.

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return_cube_nonortho()

subroutine, public cube_utils::return_cube_nonortho	(	type(cube_info_type), intent(in)	info,
		real(kind=dp), intent(in)	radius,
		integer, dimension(3), intent(out)	lb,
		integer, dimension(3), intent(out)	ub,
		real(kind=dp), dimension(3), intent(in)	rp
	)

...

Parameters

info	...
radius	...
lb	...
ub	...
rp	...

Definition at line 90 of file cube_utils.F.

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return_cube()

subroutine, public cube_utils::return_cube	(	type(cube_info_type)	info,
		real(kind=dp)	radius,
		integer, dimension(3)	lb_cube,
		integer, dimension(3)	ub_cube,
		integer, dimension(:), pointer	sphere_bounds
	)

...

Parameters

info	...
radius	...
lb_cube	...
ub_cube	...
sphere_bounds	...

Definition at line 139 of file cube_utils.F.

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return_cube_max_iradius()

integer function, public cube_utils::return_cube_max_iradius

(

type(cube_info_type)

info

)

...

Parameters

info

...

Returns

...

Definition at line 174 of file cube_utils.F.

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destroy_cube_info()

subroutine, public cube_utils::destroy_cube_info

(

type(cube_info_type)

info

)

...

Parameters

info

...

Definition at line 184 of file cube_utils.F.

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init_cube_info()

subroutine, public cube_utils::init_cube_info	(	type(cube_info_type), intent(out)	info,
		real(kind=dp), dimension(3), intent(in)	dr,
		real(kind=dp), dimension(3, 3), intent(in)	dh,
		real(kind=dp), dimension(3, 3), intent(in)	dh_inv,
		logical, intent(in)	ortho,
		real(kind=dp), intent(in)	max_radius
	)

...

Parameters

info	...
dr	...
dh	...
dh_inv	...
ortho	...
max_radius	...

Definition at line 211 of file cube_utils.F.

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