Integreat`RK`
Integreat`RK`

RKDJReduce

RKDJReduce[rk]

returns a Runge–Kutta method equivalent to rk with the unused stages removed.

Details and Options

  • RKDJReduce takes into account whether a stage is used by the embedded and dense output solution.

Examples

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Basic Examples  (2)

Remove an unused stage from a method:

The primary method of an embedded pair with the first-same-as-last property can be DJ-reduced:

Properties & Relations  (1)

DJ-reduction is an idempotent operation:

Possible Issues  (1)

This tableau may appear reducible, but with the dense output, all stages are used:

Tech Notes
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  • Runge–Kutta Methods