.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        Click :ref:`here <sphx_glr_download_auto_numerical_methods_general_methods_plot_random_generator.py>`     to download the full example code
    .. rst-class:: sphx-glr-example-title

    .. _sphx_glr_auto_numerical_methods_general_methods_plot_random_generator.py:


Random generator parametrization
================================

The seed of the pseudo random generator is initialized to 0 when the module is imported.

It means the same script will yield the same results across several replications.

It is also possible to initialize the random generator differently:

- by setting a seed
- by setting the complete generator state


.. code-block:: default

    from __future__ import print_function
    import openturns as ot
    import openturns.viewer as viewer
    from matplotlib import pylab as plt
    import os
    import time
    ot.Log.Show(ot.Log.NONE)








Example 0: using a fixed seed
-----------------------------


.. code-block:: default

    ot.RandomGenerator.SetSeed(77)








Example 1: using the python process id
--------------------------------------


.. code-block:: default

    ot.RandomGenerator.SetSeed(os.getpid())








Example 2: using the time in milliseconds
-----------------------------------------


.. code-block:: default

    ot.RandomGenerator.SetSeed(int(1000*time.time()))








Example 3: using a previously saved generator state
---------------------------------------------------


.. code-block:: default


    # use the random generator
    ot.Normal().getSample(100)
    # save the generator state
    particularState = ot.RandomGenerator.GetState()
    ot.Normal().getRealization()






.. raw:: html

    <p>[-0.40341]</p>
    <br />
    <br />

load the generator state


.. code-block:: default

    ot.RandomGenerator.SetState(particularState)
    ot.Normal().getRealization()





.. raw:: html

    <p>[-0.40341]</p>
    <br />
    <br />


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** ( 0 minutes  0.002 seconds)


.. _sphx_glr_download_auto_numerical_methods_general_methods_plot_random_generator.py:


.. only :: html

 .. container:: sphx-glr-footer
    :class: sphx-glr-footer-example



  .. container:: sphx-glr-download sphx-glr-download-python

     :download:`Download Python source code: plot_random_generator.py <plot_random_generator.py>`



  .. container:: sphx-glr-download sphx-glr-download-jupyter

     :download:`Download Jupyter notebook: plot_random_generator.ipynb <plot_random_generator.ipynb>`


.. only:: html

 .. rst-class:: sphx-glr-signature

    `Gallery generated by Sphinx-Gallery <https://sphinx-gallery.github.io>`_