netsse.analys.emep.norm_DSF
===========================

.. py:function:: netsse.analys.emep.norm_DSF(D, theta)

   Normalizes the directional spreading function.

   The function ensures that the output has a unit integral
   over wave directions.

   :param D: Directional spreading function.
   :type D: array_like of shape (nt,nf)
   :param theta: Vector of wave directions.
   :type theta: array_like of shape (nt,)

   :returns: **Dn** -- Normalized spreading function.
   :rtype: array_like of shape (nt,nf)

   .. rubric:: Example

   >>> Dn = norm_DSF(D, theta)