transformation_and_inverse (
        origin,
        step,
        axes,
        )

Return 3 by 4 matrix where first 3 columns give rotation and last column is translation.

skew_axes ( cell_angles )

Return axes corresponding to cell_angles given in degrees.

map_point ( p,  tf )

scale_and_skew (
        ijk,
        step,
        cell_angles,
        )

Apply scaling and skewing transformations.

norm ( v )

apply_rotation ( r,  v )

Grid_Subregion

Grid_Data