Download - Wolfram Research

122 2. Tutorial
difference between two successive values is controlled by the option MaxDelta. The default setting
is MaxDelta −> 1.0. This value is large enough to allow sudden steps of input voltages which are
quite usual in the case of pulse excitations.
MaxIterations
The option MaxIterations specifies the maximum number of steps that the nonlinear equation
solver should use in attempting to find a solution. The option setting can either be an integer int or
a list of two integers int int . If it is specified as a single integer int then it is equivalent to the
list int int. The first integer value defines the iteration limit for finding a DC operating point and
the second integer value the iteration limit for transient computations, respectively. If the number
of iterations for the operating-point computation exceeds the limit, an error message is generated
and the computation is interrupted. If the iteration limit for transient computations is exceeded,
the step size is reduced by the factor given by the option StepSizeFactor. The default setting is
MaxIterations −> {100, 20}.
MaxSteps
The option MaxSteps limits the total number of integration steps. The simulation is stopped
immediately if the limit is exceeded. The default setting is MaxSteps −> Automatic, which means
MaxSteps ⩵/t t / StartingStepSize .
MaxStepSize
It is sometimes possible to speed up simulations by allowing a larger maximum integration step size.
With the option MaxStepSize the present step size limit can be extended or reduced. The default
setting is MaxStepSize −> Automatic, which means MaxStepSize ⩵/t t / .
MinStepSize
The lower limit of the integration step size can be specified by the option MinStepSize. NDAESolve
stops a simulation immediately if the integration step size falls below this limit. The default setting
is MinStepSize −> Automatic, which means MinStepSize ⩵/t t / .
NonlinearMethod
The option NonlinearMethod chooses among different numerical algorithms for solving the nonlinear
algebraic systems of equations which arise due to the discretization of DAEs. By default, Mathematica’s
numerical solver FindRoot is used for this purpose. Alternatively, you can employ Analog
Insydes’ own implementation of the multi-dimensional Newton-Raphson method by specifying
NonlinearMethod −> NewtonIteration.