xlabel
==============================================

Purpose
----------------
Sets a label for the x-axis.

.. NOTE:: This function is for use with the deprecated PQG graphics, use :func:`plotSetXLabel` for equivalent functionality.

Library
-------

pgraph

Format
----------------
.. function:: xlabel(str)

    :param str: the label for the x-axis.
    :type str: string

Source
------

pgraph.src

.. seealso:: Functions :func:`title`, :func:`ylabel`, :func:`zlabel`