﻿VariableOrderOdeSolver.Options Class   # VariableOrderOdeSolverOptions Class

Class containing available options for the VariableOrderOdeSolver. Inheritance Hierarchy
SystemObject
CenterSpace.NMath.CoreVariableOrderOdeSolverOptions

Namespace: CenterSpace.NMath.Core
Assembly: NMath (in NMath.dll) Version: 7.4 Syntax
`public class Options`

The VariableOrderOdeSolverOptions type exposes the following members. Constructors
NameDescription VariableOrderOdeSolverOptions Constructs a VariableOrderOdeSolver.Options instance, setting all options to their default.
Top Properties
NameDescription AbsoluteTolerance Gets and sets the bound on the estimated error at each integration step. ConstantJacobian Gets and sets a matrix which is the constant Jacobian of the function f in the differential equation y' = f(t,y). If no matrix is specified the algorithm will check to see if a jacobian function is specified and if so use it. Otherwise jacobian is numerically computed. InitialStepSize Suggested initial step size. The solver will try this first. By default the solver determines an initial step size automatically. JacobianFunction Gets and sets a function for computing the Jacobian of the function f in the differential equation y' = f(t,y). If no function is specified the algorithm will check to see if a constant jacobian is specified and if so use it. Otherwise jacobian is numerically computed. MassMatrix Gets and sets the Mass matrix M for problems of the form M*y' = F(t,y) where M is a matrix of constant values. MassMatrixFunction Gets and sets the time-state dependent Mass matrix M(t,y) for problems of the form M(t,y)*y' = F(t,y) MaxOrder Maximum order formula used to compute the solution. Default value is 5; MaxStepSize Upper bound on step size. Defaults to one-tenth of the times span interval. NormControl Control error relative to norm of solution. If true the solver controls the error, e, in the solution, y, at each integration step by norm(e) <= max(RelativeTolerance*norm(y), AbsoluteTolerance) Default value is false. OutputFunction Gets and sets the delegate for the output function. Refine Increases the number of output points by the specified factor producing smoother output. If Refine is n which is greater than 1, the solver subdivides each time step into n smaller intervals and returns solutions at each time point. The extra values produced for Refine are computed by means of continuous extension formulas The default for RungeKutta45OdeSolver solver is 4. RelativeTolerance Bound on the estimated error at each integration step. At the ith integration step the error, e[i] for the estimated solution y[i] satisfies e[i] <= max(RelativeTolerance*Math.Abs(y[i]), AbsoluteTolerance[i]) UseBackwardDifferention Rosenbrock32stiff is a variable-order solver for stiff problems. It is based on the numerical differentiation formulas (NDFs). The NDFs are generally more efficient than the closely related family of backward differentiation formulas (BDFs), also known as Gear's methods. The ode15s properties let you choose among these formulas, as well as specifying the maximum order for the formula used.
Top Fields
NameDescription  DefaultAbsTolerance Default value for the absolute error tolerance.
Top See Also

#### Reference

CenterSpace.NMath.Core Namespace