Given a typical DiffustionTerm(coeff=D), and typical CellVariable phi, is there an easy way to obtain the Jacobian of such a system? In other words, the matrix of derivatives of all the residuals over all the cell variables. Obviously this will be quite sparse.
I am using justResidualVector() to obtain the residuals. I've been reading the online documentation and going over the mailing list, but nothing is jumping out at me.
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