Difference between revisions of "Anas2mat.m"
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Isotropic part, anisotropy, and asymmetry are often seen in the literature. It is not a good way of reporting an interaction tensor (the original matrix is best), but it is still being used. | Isotropic part, anisotropy, and asymmetry are often seen in the literature. It is not a good way of reporting an interaction tensor (the original matrix is best), but it is still being used. | ||
| − | == | + | ==Parameters== |
iso - isotropic part of the interaction, defined as | iso - isotropic part of the interaction, defined as | ||
Revision as of 18:47, 5 June 2026
Converts anisotropy and asymmatry representation of a 3x3 interaction tensor into the corresponding matrix.
Syntax
M=anas2mat(iso,an,as,alp,bet,gam)
Description
Isotropic part, anisotropy, and asymmetry are often seen in the literature. It is not a good way of reporting an interaction tensor (the original matrix is best), but it is still being used.
Parameters
iso - isotropic part of the interaction, defined as
(xx+yy+zz)/3 in terms of eigenvaues
an - interaction anisotropy, defined as zz-(xx+yy)/2
in terms of eigenvalues
as - interaction asymmetry, defined as (yy-xx)/(zz-iso)
in terms of eigenvalues
alp - alpha Euler angle in radians
bet - beta Euler angle in radians
gam - gamma Euler angle in radians
Outputs
M - 3x3 matrix
Notes
The reverse transformation (from matrix into anisotropy, asymmetry, and angles) is ill-defined.
See also
eeqq2nqi.m, castep2nqi.m, euler2dcm.m, xyz2dd.m, spsk2mat.m, axrh2mat.m
Version 2.1, authors: Ilya Kuprov
