Data Item _atom_sites.fract_transf_matrix[1][2]
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General 
- Item name
- _atom_sites.fract_transf_matrix[1][2]
- Category name
- atom_sites
- Attribute name
- fract_transf_matrix[1][2]
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 20.5 % of entries
Item Description
The [1][2] element of the 3x3 matrix used to transform Cartesian
coordinates in the ATOM_SITE category to fractional coordinates
in the same category. The axial alignments of this
transformation are described in _atom_sites.Cartn_transform_axes.
The 3x1 translation is defined in
_atom_sites.fract_transf_vector[].
|x'| |11 12 13| |x| |1|
|y'|fractional = |21 22 23| |y|Cartesian + |2|
|z'| |31 32 33| |z| |3|
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
Subcategories
| Subcategory Name | Subcategory Description |
|---|---|
| matrix | The collection of elements of a matrix. |
Aliases
| Alias Item Name | Dictionary Name | Dictionary Version |
|---|---|---|
| _atom_sites_fract_tran_matrix_12 | cif_core.dic | 2.0.1 |