Constraint variables

Constraint variables contain an expression called a residual. We must adjust the constraint variable to make the residual (as near as possible) zero. An example is a zero mass in which we have to adjust the velocity v such that when two forces F1 and F2 are applied, the following residual is zero.

At the start of the simulation run the value of the variable is determined by an iterative process. You can set the starting value to be used in this iterative process with the Change Parameters dialog box. If the iterative process is slow to converge, a better starting value may speed things up.

As with real parameters, you have access to an Expression editor.