Dakota Reference Manual: state_variables

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## Description

State variables provide a convenient mechanism for managing additional model parameterizations such as mesh density, simulation convergence tolerances, and time step controls. These are typically fixed parameters for a given Dakota run.

By default, only parameter studies and design of experiments methods will vary state variables. This can be overridden for other methods by specifying `active` `state` or `active` `all`.

When a state variable is held fixed, the specified `initial_state` is used as its sole value. If the state variable is defined only by its bounds, then the `initial_state` will be inferred from the variable bounds or valid set values.

If a method iterates on a state variable, the variable is treated as a design variable with the given bounds, or as a uniform uncertain variable with the given bounds.

## Related Topics

## Related Keywords

- continuous_state : State variable - continuous
- discrete_state_range : State variables - discrete range-valued
- discrete_state_set : State variable - discrete set-valued
- integer : Discrete state variables, each defined by a set of permissible integers
- real : Discrete state variables, each defined by a set of permissible real numbers
- string : String-valued discrete state set variables