DifferentialEquations.jl
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Allow symbolic indices to be passed to the `save_idxs` kwarg of `solve`
Can't use symbolic indices to parameterize solve(;save_idxs = ...)
- Often I want to just save an observed variable when solving an
ODEProblem
, to save on memory during large batch solves. - Currently that isn't possible because the observed variable is rightfully not included within
u
, but computed lazily via the solution.- Resorted to defining my own tedious
save_func(u, t, integrator)
callback, forcing me to redefine my observable equations in terms ofu[idx]
.
- Resorted to defining my own tedious
- If I still want to symbolically index the
ODESolution
for my observed variable, I have to save all of the variables duringsolve
, which is a lot of waste for larger systems.
Would be nice to be able to pass in symbols to solve
to be saved, like solve(odeprob, alg; save_idxs = [:obs, ...]
Basically, I'd like solve
to handle symbolic indices from an ODESystem
just like remake
and solution indexing already do.