Jacob Stevens-Haas

@znicolaou, you bring up some really good points, and its forcing me to get into the code and understand the weak form better. I suppose there's more value to be...

As an addition, the constraints made by example 8's `make_constraints()` appear to be in neither in "row" or "target" format, since `reorder_constraints(constraint_lhs, 2, "row")` and `reorder_constraints(constraint_lhs, 2, "target")` both change...

Ohhh, that makes sense if the terms are flattened in fortran order/interspersed, like if $\dot x = c_{11} f_1 + c_{12} f_2$ and $\dot y = c_{21} f_1 + c_{22}...

> Remember that "u" here is the fluid velocity :man_facepalming: Of course. That makes sense. Hey @MPeng5 , thanks for following up! I'd love to talk about this but I'm...

@MPeng5 why don't you also open a PR for `trapping-extended` so it's possible to attach questions to specific lines?

The only thing I notice about your code is that, when fitting an SVD, you should just use the right singular vectors. I.e. in $$A = U S V^T$$ You...

Try the examples folder here. Alternatively, you can simulate a 1D heat equation as an ODE by using the fourier transform. See [an example in the tests of this repo](https://github.com/dynamicslab/pysindy/blob/638e4bb1657ee9a7caaeca753ec0749f32f194fa/test/conftest.py#L92)

Thanks for giving pysindy a try! First question is whether speed and power are evolving independently, i.e. no external control? Second thing is that real-life sensor data often includes weird...

To piggy back on what @nkoudounas mentioned, normalization is an [optimizer option, disabled by default](https://github.com/dynamicslab/pysindy/blob/098d2312522e21f01c159e34ddbae58c37f94b03/pysindy/optimizers/base.py#L94). To enable it, set `normalize_columns=True` when you initialize your optimizer.

bottom line up front: I think pysindy isn't the right way to approach this. > sampling time of 5 seconds If that means there's a single measurement of spindle speed...