In the Compile Equations () node’s Settings window, you specify which study and study step to use when computing the current solver configuration and compiling the equations to solve. The node displays the name of the selected study step: Compile Equations: Stationary, for example. Right-click this node and select Statistics to see the number of degrees of freedom for the solver (see The Statistics Page).

Specify the study in the Use study list and the study step in the Use study step list. By default you get the parent study and its first study step.

Complex variables are by default represented by complex-valued degrees of freedom. By selecting the Split complex variables in real and imaginary parts check box, the representation of complex variables is changed to using separate real degrees of freedom for the real and imaginary parts. The split representation can improve convergence where nonanalytic functions of complex variables are used in equations. Using a split representation also makes it possible to avoid complex pollution (a small nonzero imaginary component) of real variables by specifying a real or complex value type for variables. If you use a split representation of complex variables, specify the value type of dependent variables in the Discretization sections in the Settings windows for the main physics nodes (to see this setting, click the Show button () and select Advanced Physics Options).