.. _model-single:

""""""
single
""""""


A model with one of each block: variable, interface, and response


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

   model-single-interface_pointer
   model-single-solution_level_control
   model-single-solution_level_cost
   model-single-cost_recovery_metadata


**Specification**

- *Alias:* simulation 

- *Arguments:* None

- *Default:* N/A ( single if no model specification)


**Child Keywords:**

+-------------------------+--------------------+----------------------------+-----------------------------------------------+
| Required/Optional       | Description of     | Dakota Keyword             | Dakota Keyword Description                    |
|                         | Group              |                            |                                               |
+=========================+====================+============================+===============================================+
| Optional                                     | `interface_pointer`__      | Interface block pointer for the single model  |
|                                              |                            | type                                          |
+----------------------------------------------+----------------------------+-----------------------------------------------+
| Optional                                     | `solution_level_control`__ | Cost estimates associated with a set of       |
|                                              |                            | solution control values.                      |
+-------------------------+--------------------+----------------------------+-----------------------------------------------+
| Optional (Choose One)   | Cost model for 1   | `solution_level_cost`__    | Cost estimates associated with a set of       |
|                         | or more resolution |                            | solution control values.                      |
|                         | levels             +----------------------------+-----------------------------------------------+
|                         |                    | `cost_recovery_metadata`__ | Identify metadata by label for capturing      |
|                         |                    |                            | online cost estimates                         |
+-------------------------+--------------------+----------------------------+-----------------------------------------------+

.. __: model-single-interface_pointer.html
__ model-single-solution_level_control.html
__ model-single-solution_level_cost.html
__ model-single-cost_recovery_metadata.html



**Description**


The single model is the simplest model type. It uses a single
:dakkw:`interface` instance to map :dakkw:`variables`
into :dakkw:`responses`. There is no recursion in this case.

The optional :dakkw:`model-single-interface_pointer` specification identifies the interface block
by cross-referencing with the ``id_interface`` string input from a particular interface keyword specification.
This is only necessary when the input file has multiple interface blocks, and you
wish to explicitly point to the desired block.
The same logic follows for responses and variables blocks and pointers.



**Examples**


The example shows a minimal
specification for a single model, which is the default model when no
models are specified by the user.

.. code-block::

    model
      single

This example does not provide any pointer strings and therefore relies
on the default behavior of constructing the model with the last
variables, interface, and responses specifications parsed.