cctbx::sgtbx::tensor_rank_2 Namespace Reference

Symmetry constraints for tensors of rank 2. More...

Classes
class	constraints
	Handling of symmetry constraints for tensors of rank 2. More...
class	cartesian_constraints
Namespaces
namespace	cartesian_constraints_constants
	Outside template class to avoid complications.
Functions
int *	constraints_raw (const int *r, int *c)
	Coefficients r.transpose() * c * r - c = 0.
int *	constraints_raw (af::const_ref< rt_mx > const &symmetry_matrices, std::size_t i_first_matrix_to_use, bool reciprocal_space, int *c)
	Coefficients r.transpose() * c * r - c = 0 for all symmetry_matrices.

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Detailed Description

Symmetry constraints for tensors of rank 2.

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Function Documentation

int* cctbx::sgtbx::tensor_rank_2::constraints_raw	(	const int *	r,
		int *	c
	)

Coefficients r.transpose() * c * r - c = 0.

Mathematica code: r={{r0,r1,r2},{r3,r4,r5},{r6,r7,r8}} c={{c0,c3,c4},{c3,c1,c5},{c4,c5,c2}} FortranForm[Expand[Transpose[r].c.r - c]]