zlabel
==============================================

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

.. NOTE:: This function is for the deprecated PQG graphics.

Library
-------

pgraph

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

    :param str: the label for the Z axis.
    :type str: string

Source
------

pgraph.src

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