Model linearization fails when no parameter is used about modelingtoolkit.jl HOT 5 CLOSED

The problem here is not the lack of parameters, it's the lack of inputs. If you are only after the state jacobian (the A matrix), see calculate_jacobian instead.

julia> calculate_jacobian(model)
2×2 Matrix{Num}:
 0  -1
 1   0

A side note, linearize expects model and not sys, i.e., you may not call structural_simplify on the system before calling linearize

from modelingtoolkit.jl.

Thanks for the tips @baggepinnen. However, given what you say, can you explain why the linearizarion works (understand does not error) if a dummy parameter is passed, even on a structurally simplified model?

from modelingtoolkit.jl.

Probably a coincidence since the example is very small and simple. It will not work in general.

from modelingtoolkit.jl.

@baggepinnen OK. Should there be some documentation or more explicit error in case of absence of input? Or a generic fallback returning empty B, C, D matrices ?

from modelingtoolkit.jl.

I'll close this for now as the use case seems a bit different now with v9

from modelingtoolkit.jl.