Rayleigh distribution

The probability density function for Rayleigh distribution is:

.. math::

f(x) = x \exp(-x^2/2)

for a real number :math:x \ge 0.

The following plots show the pdf and cdf:

.. image:: ../../../../tests/imgs/stats/continuous/rayleigh/rayleighpdf.png :align: center :width: 480

.. image:: ../../../../tests/imgs/stats/continuous/rayleigh/rayleighcdf.png :align: center :width: 480