updated docs

Author: akaszynski

docs/loading_emat.rst

@@ -23,7 +23,7 @@ Read a single element from the result file:
 
 .. code:: python
 
-    element_data = emat_file.read_element(0)
+    dof_ref, element_data = emat_file.read_element(0)
 
 The dictionary ``element_data`` contains the entries used to construct stiffness, mass, and damping matrices.  If recorded, the dictionary will also applied force vectors.
 
@@ -38,6 +38,66 @@ Read accumulated applied force for all nodes:
 
 See ``emat_file.nnum`` for the sorted nodes this applied force corresponds to.
 
+
+DOF Reference
+~~~~~~~~~~~~~
+Each degree of freedom index from ``read_element`` corresponds to a
+physical degree of freedom.  The table of this correspondence is
+below:
+
++---------+---------+
+| Index   | DOF     |
++---------+---------+
+| 1       | UX      |
++---------+---------+
+| 2       | UY      |
++---------+---------+
+| 3       | UZ      |
++---------+---------+
+| 4       | ROTX    |
++---------+---------+
+| 5       | ROTY    |
++---------+---------+
+| 6       | ROTZ    |
++---------+---------+
+| 7       | AX      |
++---------+---------+
+| 8       | AY      |
++---------+---------+
+| 9       | AZ      |
++---------+---------+
+| 10      | VX      |
++---------+---------+
+| 11      | VY      |
++---------+---------+
+| 12      | VZ      |
++---------+---------+
+| 16      | WARP    |
++---------+---------+
+| 17      | CONC    |
++---------+---------+
+| 18      | HDSP    |
++---------+---------+
+| 19      | PRES    |
++---------+---------+
+| 20      | TEMP    |
++---------+---------+
+| 21      | VOLT    |
++---------+---------+
+| 22      | MAG     |
++---------+---------+
+| 23      | ENKE    |
++---------+---------+
+| 24      | ENDS    |
++---------+---------+
+| 25      | EMF     |
++---------+---------+
+| 26      | CURR    |
++---------+---------+
+| 27 - 32 | Spares  |
++---------+---------+
+
+
 EmatFile Object Methods
 -----------------------
 .. autoclass:: pyansys.emat.EmatFile