.. _example_08:

(8) A 3-D histogram
-------------------

The program :doc:`psxyz </psxyz>` allows us to plot
three-dimensional symbols, including columnar plots. As a simple
demonstration, we will convert a gridded netCDF of bathymetry into an
ASCII *xyz* table and use the height information to draw a 2-D
histogram in a 3-D perspective view. Our gridded bathymetry file is
called ``guinea_bay.nc`` and covers the region from 0 to 5 E and 0 to 5 N. Depth ranges
from -5000 meter to sea-level. We produce the Figure by running this script:

.. literalinclude:: /_verbatim/example_08.txt
   :language: bash

.. figure:: /_images/example_08.*
   :width: 500 px
   :align: center

   A 3-D histogram.