Calculate
_________

.. code-block:: python

    from girs.rast.math_op import calculate
    r_out = calculate('(A+B)/2',
                      A='D:/tmp/chirps/chirps-v2.0.2016.01.10.tif',
                      B='D:/tmp/chirps/chirps-v2.0.2016.01.11.tif',
                      output_raster='D:/tmp/calc.tif')

.. _calc:

.. figure:: images/calc.jpg
    :width: 500pt