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Hello I would ask you if the dvode

Hello I would ask you if the dvode

Hello I would ask you if the dvode

(OP)
Hello
I would ask you if the dvode fortran code can generate automatically the jacobien matrix or we mut added it
best regards

RE: Hello I would ask you if the dvode

You will find the answer in the source file - e.g.see: http://www.netlib.no/netlib/ode/vode.f

CODE

C. If the problem is stiff, you are encouraged to supply the Jacobian
directly (MF = 21 or 24), but if this is not feasible, DVODE will
compute it internally by difference quotients (MF = 22 or 25). 

RE: Hello I would ask you if the dvode

(OP)
Thank you for this infromation.
Ok, when I chose MF=22
some errors appear during the execution like
DVODE-- At current T (=R1), MXSTEP (=I1) steps
taken on this call before reaching TOUT
In above message, I1 = 500
In above message, R1 = 0.4309613453595D+01



Error halt: ISTATE = -1

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