Diffential equations anylogic
Mixed equations – preferred method used to solve algebraic-differential equations. By default, automatic method is selected, which chooses the fastest possible method for the current equation set. By default, automatic method is selected, which chooses the fastest possible method for the current equation set.Īlgebraic equations – preferred method used to solve algebraic equations. Numerical methods sectionĭifferential equations – preferred method used to solve ordinary differential equations. Additional page of experiment’s properties window. You can set up numerical methods used for solving equations in the Numerical methods section on the Additional page of the experiment’s properties window (see Figure 55).įigure 55. AnyLogic provides the rich collection of numerical methods for solving ordinalĭifferential equations (ODE), algebraic-differential equations (DAE), or algebraic equations (NAE).īy default, the numerical solver is chosen automatically by AnyLogic at runtime. During the simulation, this DES is solved by one of the numerical methods built in AnyLogic. When a model starts, the equations are assembled into the main differential equation system. You should set up the initial approximation just before the set of equations is activated e.g., in the entry action of the state containing equations. In case it has, it is recommended to give a good initial approximation to the solution. In case of error of the third type, you should analyze the set of algebraic equations to find out if it has a solution. The set of equations cannot be solved with the given initial values.a variable appears more than once on the left-hand side. Incorrectly constructed set of equations, e.g.division by zero or square root of a negative value.
For example, when var1 initializes var2, var2 initializes var3, and var3 initializes var1. In our example it looks like:Īn algebraic loop also happens when initial values of two variables refer to each other. Algebraic loops and substitutes formulas with necessary equations.