Tenseur calculus

() More...

Functions
Tenseur	Lorene::operator* (const Tenseur &, const Tenseur &)
	Tensorial product. More...
Tenseur	Lorene::operator% (const Tenseur &, const Tenseur &)
	Tensorial product with desaliasing. More...
Tenseur	Lorene::contract (const Tenseur &, int id1, int id2)
	Self contraction of two indices of a Tenseur . More...
Tenseur	Lorene::contract (const Tenseur &, int id1, const Tenseur &, int id2)
	Contraction of two Tenseur . More...
Tenseur	Lorene::flat_scalar_prod (const Tenseur &t1, const Tenseur &t2)
	Scalar product of two Tenseur when the metric is : performs the contraction of the last index of t1 with the first one of t2 , irrespective of the type of these indices. More...
Tenseur	Lorene::flat_scalar_prod_desal (const Tenseur &t1, const Tenseur &t2)
	Same as flat_scalar_prod but with desaliasing. More...
Tenseur	Lorene::manipule (const Tenseur &, const Metrique &, int idx)
	Raise or lower the index idx depending on its type, using the given Metrique . More...
Tenseur	Lorene::manipule (const Tenseur &, const Metrique &)
	Raise or lower all the indices, depending on their type, using the given Metrique . More...
Tenseur	Lorene::skxk (const Tenseur &)
	Contraction of the last index of (*this) with or , depending on the type of S . More...
Tenseur	Lorene::lie_derive (const Tenseur &t, const Tenseur &x, const Metrique *=0x0)
	Lie Derivative of t with respect to x . More...
Tenseur	Lorene::sans_trace (const Tenseur &tens, const Metrique &metre)
	Computes the traceless part of a Tenseur of valence 2. More...

Detailed Description

()

Function Documentation

contract() [1/2]

Tenseur Lorene::contract	(	const Tenseur &	source,
		int	id1,
		int	id2
	)

Self contraction of two indices of a Tenseur .

The two indices must be of different type, i.e. covariant and contravariant, or contravariant and covariant.

Parameters

id1	[input] number of the first index for the contraction; id1 must be strictly lower than the valence of the tensor and obeys the following convention: id1 = 0 : first index id1 = 1 : second index and so on...
id2	[input] number of the second index for the contraction; id2 must be strictly lower than the valence of the tensor and obeys the following convention: id2 = 0 : first index id2 = 1 : second index and so on...

Definition at line 282 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

contract() [2/2]

Tenseur Lorene::contract	(	const Tenseur &	t1,
		int	id1,
		const Tenseur &	t2,
		int	id2
	)

Contraction of two Tenseur .

The two indices must be of different type, i.e. covariant and contravariant, or contravariant and covariant.

Parameters

id1	[input] number of the index of contraction for the first Tenseur ; id1 must be strictly lower than the valence of the tensor and obeys the following convention: id1 = 0 : first index id1 = 1 : second index and so on...
id2	[input] number of index of contraction for the second one; id2 must be strictly lower than the valence of the tensor and obeys the following convention: id2 = 0 : first index id2 = 1 : second index and so on...

Definition at line 351 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

flat_scalar_prod()

Tenseur Lorene::flat_scalar_prod	(	const Tenseur &	t1,
		const Tenseur &	t2
	)

Scalar product of two Tenseur when the metric is : performs the contraction of the last index of t1 with the first one of t2 , irrespective of the type of these indices.

Definition at line 656 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

flat_scalar_prod_desal()

Tenseur Lorene::flat_scalar_prod_desal	(	const Tenseur &	t1,
		const Tenseur &	t2
	)

Same as flat_scalar_prod but with desaliasing.

Definition at line 738 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

lie_derive()

Tenseur Lorene::lie_derive	(	const Tenseur &	t,
		const Tenseur &	x,
		const Metrique *	met = 0x0
	)

Lie Derivative of t with respect to x .

If no other argument is given, it uses partial derivatives with respect to cartesian coordinates to calculate the result (this is the default). Otherwise, it uses the covariant derivative associated to the metric given as last argument.

Definition at line 819 of file tenseur_operateur.C.

References Lorene::Tenseur::get_etat().

manipule() [1/2]

Tenseur Lorene::manipule	(	const Tenseur &	t1,
		const Metrique &	met,
		int	idx
	)

Raise or lower the index idx depending on its type, using the given Metrique .

Definition at line 512 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

manipule() [2/2]

Tenseur Lorene::manipule	(	const Tenseur &	t1,
		const Metrique &	met
	)

Raise or lower all the indices, depending on their type, using the given Metrique .

Definition at line 565 of file tenseur_operateur.C.

References Lorene::manipule(), and Lorene::Tenseur::valence.

operator%()

Tenseur Lorene::operator%	(	const Tenseur &	t1,
		const Tenseur &	t2
	)

Tensorial product with desaliasing.

Definition at line 202 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

operator*()

Tenseur Lorene::operator*	(	const Tenseur &	t1,
		const Tenseur &	t2
	)

Tensorial product.

Definition at line 122 of file tenseur_operateur.C.

References Lorene::Tenseur::etat.

sans_trace()

Tenseur Lorene::sans_trace	(	const Tenseur &	tens,
		const Metrique &	metre
	)

Computes the traceless part of a Tenseur of valence 2.

Parameters

tens	[input] the Tenseur of valence 2
metre	[input] the metric used to raise or lower the indices

Returns

The traceless part of the input Tenseur

Definition at line 900 of file tenseur_operateur.C.

References Lorene::Tenseur::get_etat().

skxk()

Tenseur Lorene::skxk

(

const Tenseur &

source

)

Contraction of the last index of (*this) with or , depending on the type of S .

The calculation is performed to avoid singularities in the external zone. This is done only for a flat metric.

Definition at line 583 of file tenseur_operateur.C.

References Lorene::Tenseur::etat, and Lorene::Tenseur::valence.