[firedrake] Pass approximate Jacobian to derivative() call

[Buesing, Henrik]

Dear all,

is it possible to just pass the approximate Jacobian to the derivative call? Since it's so complicated in my case to get the exact Jacobian I would like to do sth. like

du = [(F(u + h) - F(u - h))/(2*h)]

Thank you!

Henrik






--
Dipl.-Math. Henrik Büsing
Institute for Applied Geophysics and Geothermal Energy
E.ON Energy Research Center
RWTH Aachen University
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Mathieustr. 10            |    Tel +49 (0)241 80 49907
52074 Aachen, Germany     |    Fax +49 (0)241 80 49889
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hbuesing at eonerc.rwth-aachen.de
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