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Save Jacobian While Solving with NDSolve

How does ones save the Jacobian matrix while solving a system of ODEs with NDSolve?
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You can look up  NDSolve`EvaluateJacobianWithSolutionData  in the tutorial Components and Data Structures.
POSTED BY: Michael Rogers
Hi,

You can define a tangent system and solve it with NDSolve, that will give you the Jacobian.
Also, ParametricNDSolve may be of help to you.
I.M.
POSTED BY: Ivan Morozov
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