.. _method-fsu_cvt-trial_type:

""""""""""
trial_type
""""""""""


Specify how the trial samples are generated


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

   method-fsu_cvt-trial_type-grid
   method-fsu_cvt-trial_type-halton
   method-fsu_cvt-trial_type-random


**Specification**

- *Alias:* None

- *Arguments:* None

- *Default:* random


**Child Keywords:**

+-------------------------+--------------------+--------------------+---------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword     | Dakota Keyword Description                  |
|                         | Group              |                    |                                             |
+=========================+====================+====================+=============================================+
| Required (Choose One)   | Trial Type         | `grid`__           | Samples on a regular grid                   |
|                         |                    +--------------------+---------------------------------------------+
|                         |                    | `halton`__         | Generate samples from a Halton sequence     |
|                         |                    +--------------------+---------------------------------------------+
|                         |                    | `random`__         | Uses purely random Monte Carlo sampling to  |
|                         |                    |                    | sample variables                            |
+-------------------------+--------------------+--------------------+---------------------------------------------+

.. __: method-fsu_cvt-trial_type-grid.html
__ method-fsu_cvt-trial_type-halton.html
__ method-fsu_cvt-trial_type-random.html



**Description**


The user has the option to specify the method by which the
trials are created to adjust the centroids. The ``trial_type``
can be one of three types:

- ``random``, where points are generated randomly
- ``halton``, where points are generated according to the Halton sequence
- ``grid``, where points are placed on a regular grid over the hyperspace.