Update Documentation

docs/source/topics/data_types.rst

@@ -284,6 +284,27 @@ The user also has to specify the units for both ``x`` and ``y``:
 
   In [4]: xy.set_y(np.array([1, 2, 3, 4]), 'Volume Expansion', '%')
 
+  To retrieve the ``x`` values and their metadata, you can use the :py:meth:`~aiida.orm.XyData.get_x` method:
+
+.. code-block:: ipython
+
+  In [5]: x_name, x_array, x_units = xy.get_x()
+
+Similarly, to retrieve the ``y`` values and their metadata, use the :py:meth:`~aiida.orm.XyData.get_y` method:
+
+.. code-block:: ipython
+
+  In [6]: y_values = xy.get_y()
+  In [7]: for y_name, y_array, y_units in y_values:
+     ...:     print(y_name, y_array, y_units)
+
+You can also retrieve the names of all ``y`` arrays using :py:meth:`~aiida.orm.XyData.get_y_arraynames`:
+
+.. code-block:: ipython
+
+  In [8]: y_names = xy.get_y_arraynames()
+  In [9]: print(y_names)
+
 Note that you can set multiple ``y`` values that correspond to the ``x`` grid.
 Same as for the :py:class:`~aiida.orm.ArrayData`, the names and shapes of the arrays are stored to the database, the content of the arrays is stored to the repository in the `numpy format <https://numpy.org/doc/stable/reference/generated/numpy.lib.format.html#npy-format>`_ (``.npy``).