The ODE States Collection node () groups the ODE states that match a certain regular expression into a single ODE entity.

The ODE entity displays as a Field node under the Dependent Variables branch in the Solver Sequence branch when generating the solver sequence. This enables default solver settings to be made on each collection that affects all ODE states in the collection at once.

The Settings window has the following sections:

Enter the default name in the Name field. This is the name that the collection gets in the first interface added to a model. Subsequently added interfaces automatically get the first unique name. Use the dep. prefix and the default name to refer the collection when specifying solver defaults. The text entered in the Description field appear in the Dependent Variable section of the physics interface. In this section you can change the name of the collection.

Enter a regular expression in the Include states pattern (regular expression) field. The collection contains all ODE states that match this pattern.

Choose Real or Complex (the default) from the Default value type list. This becomes the default choice when solving with splitting of complex degrees of freedoms (DOFs) into real-valued and complex-valued DOFs.