How to avoid multiple Jacobian calls
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Hi all,
I have a problem: when solving a stiff differential equation system (with analytical jacobian provided by me), I noticed (using the profile viewer) that, over the total 33 hours needed to solve the system, 30 are dedicated to calculate the Jacobian analytical matrix.
Now, the Jacobian matrix is a 11000x11000 matrix and, to be computed it uses a lot of "if" and "for", for this reason it takes so long to be calculated.
The ode23s calls the function 32 times (so every call need approx. 1 hour to compute the Jacobian matrix).
Is it possible to avoid the calculation of the Jacobian matrix at every call? I was wondering if it wasn't possible to calculate it just one time and then exploit other functions or the global variables...
Thanks for your help
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