.. _method-approximate_control_variate-rng-rnum2:

"""""
rnum2
"""""


Generates pseudo-random numbers using the Pecos package


.. toctree::
   :hidden:
   :maxdepth: 1



**Specification**

- *Alias:* None

- *Arguments:* None


**Description**


The ``rnum2`` keyword directs Dakota to use pseudo-random numbers
generated by the Pecos package.

*Default Behavior*

``rnum2`` is not used by default.  To change this behavior, it must be
specified in conjuction with the ``rng`` keyword.

*Usage Tips*

Use of the Mersenne twister random number generator ( ``mt19937``) is
recommended over ``rnum2``.



**Examples**



.. code-block::

    method
      sampling
        sample_type lhs
        samples = 10
        seed = 98765
        rng rnum2