plotAddHistF
==============================================

Purpose
----------------
Adds a frequency histogram to an existing graph.

Format
----------------
.. function:: plotAddHistF([myPlot, ]f, c)

    :param myPlot: Optional argument. A :class:`plotControl` structure.
    :type myPlot: struct

    :param f: frequencies to be graphed.
    :type f: Nx1 vector

    :param c: numeric labels for categories. If this is a scalar 0, a sequence from 1 to ``rows(f)`` will be created.
    :type c: Nx1 vector


Remarks
-------

:func:`plotAddHistF` may only add a histogram to 2-D graphs.

This function will not change any of the current graph's settings other
than to resize the view as necessary to display the new curve.

.. seealso:: Functions :func:`plotAddBar`, :func:`plotAddHist`, :func:`plotAddHistP`, :func:`plotAddPolar`, :func:`plotAddXY`