Improve Rosenbrock finite difference by swapping dt with J #1611
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YingboMa
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YingboMa
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src/nlsolve/nlsolve.jl
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| # This is for numerical differentiation cache correctness | ||
| # Requires Newton methods are FSAL | ||
| nlsolver.cache.du1 .= integrator.fsalfirst |
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Right, all the methods are programmatically FSAL for dense outputs, we should use it well. BTW, can we simply set integrator.fsalfirst === nlsolver.cache.du1? Will that lead to incorrectness?
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du1 can get overwritten/changed, for example in the central differencing method, so it's not always correct.
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Fixes SciML/DifferentialEquations.jl#773