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You could count it yourself. int numfcalls=0; int my_f_func(...) { numfcalls++; ... } Maybe I'm not understanding your question? -John Weeks > On Jul 22, 2022, at 8:57 AM, Jianqi...

On Sat, Jul 23, 2022 at 1:51 AM Jianqi Xi < ***@***.***> wrote: > I have one quick question about how we could determine the number of times > the...

Hi Janqi, If you are using Modified Newton Iteration for the nonlinear solver, SUNDIALS only updates the Jacobian once in a while based on whether a convergence failure occurs in...

You cannot completely control the step sizes chosen by CVODE, which are based on local errors and the input tolerances.  You can only specify minimum and maximum values. -Alan H...

Hello Dan, This equation is the same as an ODE for y[eeq] so should not itself be a cause for difficulty.  Are there ODEs for y[veq] and y[ieq]? If not,...

Hi Dan, Are you confident that the DAE system is well-posed?  E.g., is the algebraic equation for the voltage solvable for the voltage as a function of the other variables?...

Hi Dan, There is nothing obviously wrong with the equation you posted and nothing that would prevent IDA from solving it. Your instinct is right -- isolated large residual sometimes...