State
The State node () is an attribute node that handles settings for state variables. A state is composed of a set of ODE variables. Each state has a separate State node. This attribute is used together with the Dependent Variables node.
General
The State Components section displays the variable names for the states components. Also, when internal extra variables are used, these are displayed here as Internal Variables.
Use the Solve for this state check box to control whether to solve for the state or not. This setting is only available if the Dependent Variables node’s setting Defined by study step is set to User defined. If the variable is not solved for, its values are determined by the settings in the Values of Variables Not Solved For section of the corresponding Dependent Variables operation node.
Use the Store in output check box to control whether to store the variable in any output solution or not.
A variable can still be solved for despite not being stored in output and vice versa.
Scaling
Control the scaling of a variable with the Method list.
Specifying a Method for a variable here overrides the Method selected in the Scaling section of the corresponding Variables operation node unless From parent is selected.
Select:
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Automatic to get an automatically determined scaling.
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From parent to use the scaling type selected in the Method list in the Scaling section of the corresponding Variables operation node.
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Initial value based to get a scaling that is determined from the initial values. Use this if the components of the initial values give a good estimate of the order of magnitude of the solution.
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Manual to manually enter a scaling. Then enter a value in the Scale field.
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None to get no scaling.