.. _method-coliny_pattern_search-pattern_basis:

"""""""""""""
pattern_basis
"""""""""""""


Pattern basis selection


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

   method-coliny_pattern_search-pattern_basis-coordinate
   method-coliny_pattern_search-pattern_basis-simplex


**Specification**

- *Alias:* None

- *Arguments:* None

- *Default:* coordinate


**Child Keywords:**

+-------------------------+--------------------+--------------------+---------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword     | Dakota Keyword Description                  |
|                         | Group              |                    |                                             |
+=========================+====================+====================+=============================================+
| Required (Choose One)   | Pattern Basis Type | `coordinate`__     | Use coordinate directions as search pattern |
|                         |                    +--------------------+---------------------------------------------+
|                         |                    | `simplex`__        | Use a minimal simplex for the search        |
|                         |                    |                    | pattern                                     |
+-------------------------+--------------------+--------------------+---------------------------------------------+

.. __: method-coliny_pattern_search-pattern_basis-coordinate.html
__ method-coliny_pattern_search-pattern_basis-simplex.html



**Description**


The particular form of the search pattern is controlled by the
``pattern_basis`` specification.  If ``pattern_basis`` is ``coordinate``
basis, then the pattern search uses a plus and minus offset in each
coordinate direction, for a total of *2n* function evaluations in the
pattern.  This case is depicted in Figure 5.3 for three coordinate
dimensions.