Parameters are fixed values that represent model inputs, fixed constants, or any other value that does not change. Parameters are not modified by the solver as it searches for a solution. As such, parameters do not contribute to the number of degrees of freedom (DOF).

Parameters are declared in the *Parameters ... End Parameters* section of the model file. The parameters may be defined in one section or in multiple declarations throughout the model. Parameter initialization is performed sequentially, from top to bottom. If a parameter does not have an initial value given, a default value of 1.0 is assigned. Parameters may also be a function of other parameters or variable initial conditions. These initial conditions are processed once as the first step after the model parsing.

! Example model that demonstrates parameter declarations Model example Parameters p0 ! no initial value provided - default = 1 p1 = 1.5 ! initializes to 1.5 p2 = 2 * p1 ! initializes to 3.0 p3 = exp(p2) * p1 ! initializes to exp(3.0) * 1.5 my_parameter = 1 ! initializes to 1.0 End Parameters End Model |

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Page last modified on June 16, 2015, at 06:43 PM