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dynamicslab / pysindy

A package for the sparse identification of nonlinear dynamical systems from data
https://pysindy.readthedocs.io/en/latest/
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SINDy-PI/ one state derivative per model #519

Closed yasheel222 closed 2 days ago

yasheel222 commented 2 weeks ago

I am trying to recover equations of three state system, using weak PDE library to implement SINDy-PI. Is there a way to add contraints to the library functions so that I can force only one temporal derivative in a every proposed model at a time.

Jacob-Stevens-Haas commented 2 weeks ago

There's an implicit_terms argument to WeakPDELibrary and PDELibrary that will do what I think you want

yasheel222 commented 2 weeks ago

I will be a bit more descriptive. Say input state vector has three components (x,s,p) Now from what I understand implicit_terms argument will generate custom library with derivative terms for each component i.e. x_t, s_t, p_t. What I mean to ask is that can I somehow further constraint it so that say I can choose only x_t to be in library?

Jacob-Stevens-Haas commented 2 weeks ago

I don't think you can do that.