Maximum order

Order of numerical differentiation formulas used for ode15s solver

Model Configuration Pane: Solver

Description

Specify the order of the numerical differentiation formulas (NDFs) used for the ode15s solver.

Dependencies

To enable this parameter:

Set the solver Type to Variable-step.
Set the Solver parameter to ode15s (stiff/NDF).

Settings

5 (default) | 4 | 3 | 2 | 1

The number you select specifies the order of the NDFs used by the ode15s solver. For example, when you select 3, the ode15s solver uses third order NDFs.

Using higher order NDFs produces a more accurate result, but the solver is less stable.

For stiff systems that require more stability, reduce the maximum order to 2, which is the highest order for which the NDFs are A-stable. Alternatively, try the ode23s solver, which is a lower order and A-stable solver.

Recommended Settings

The table summarizes recommended values for this parameter based on considerations related to code generation.

Application	Setting
Debugging	No impact
Traceability	No impact
Efficiency	No impact
Safety precaution	No impact

Programmatic Use

Parameter: MaxOrder

Type: scalar

Value: 1 | 2 | 3 | 4 | 5

Default: 5

Version History

Introduced before R2006a