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Title: Better I/O systems support for phase plots by murrayrm · Pull Request #1001 · python-control/python-control · GitHub

Open Graph Title: Better I/O systems support for phase plots by murrayrm · Pull Request #1001 · python-control/python-control

X Title: Better I/O systems support for phase plots by murrayrm · Pull Request #1001 · python-control/python-control

Description: This PR provides better I/O systems support for making phase plots: Allow I/O systems with no inputs and/or no outputs to be specified. This is useful when generating phase plots, where you might just have a simple dynamical systems but still want to use the I/O system objects. Improve the error messages in input_output_response when the number of states, inputs, or outputs are incompatible with the system size by telling you which one didn't match. Generate warnings when simulations fail for individual initial conditions and drop individual trace (rather than terminating). This yields much nicer phase plane plots by allowing the system to generate lines when it can and ignoring the rest. Added Jupyter notebook analyzing open and closed loop dynamics of an inverted pendulum, showing off some of the capabilities of the package. Changed the way plot titles are created, using axes.set_title (centers title over axes) instead of fig.suptitle (centers over figure, which is good for multi-axes plots but otherwise looks funny). I'll propagate this same change to time plots and frequency plots in separate PRs. Did some tweaking on arrow placement so that very short lines have zero or one arrows. Could use more work, but this is better than what we had. As an example of the changes, here is the code to produce a phase portrait for the inverted pendulum example in FBS2e, Figure 5.4: from math import pi import control as ct def invpend_update(t, x, u, params): m, l, b, g = params['m'], params['l'], params['b'], params['g'] return [x[1], -b/m * x[1] + (g * l / m) * np.sin(x[0])] invpend = ct.nlsys( invpend_update, states=2, inputs=0, name='invpend', params={'m': 1, 'l': 1, 'b': 0.2, 'g': 1}) ct.phase_plane_plot(invpend, [-2*pi - 1, 2*pi + 1, -2, 2], 10) Before: After: The changes are not major, but if you look at the number and spacing of arrows along the streamlines, you'll see examples of the changes there (some streamlines have no arrows in "before" plot). Also note the change in location of the title.

Open Graph Description: This PR provides better I/O systems support for making phase plots: Allow I/O systems with no inputs and/or no outputs to be specified. This is useful when generating phase plots, where you might...

X Description: This PR provides better I/O systems support for making phase plots: Allow I/O systems with no inputs and/or no outputs to be specified. This is useful when generating phase plots, where you might...

Opengraph URL: https://github.com/python-control/python-control/pull/1001

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ff2fe8d add better check for find_eqpt with mixed specifications murrayrm Apr 20, 2024 https://github.com/python-control/python-control/pull/1001/commits/ff2fe8d5166b5990cdd7fec8e16a1d5af42ee1de
df2436f fix nlsys conversion of float, array to dt=None murrayrm May 11, 2024 https://github.com/python-control/python-control/pull/1001/commits/df2436f64cb7471f34c59de3f15f9b8c3e354447
f6f88f8 add support for nlsys w/out inputs or outputs murrayrm May 11, 2024 https://github.com/python-control/python-control/pull/1001/commits/f6f88f8e39112a51a78c491795c083dd18735bc2
d44a577 allow solve_ivp errors and improve arrow placement murrayrm Jun 5, 2024 https://github.com/python-control/python-control/pull/1001/commits/d44a5771e4b71a34b7ec5334b1ed11765d10cd99
1b71fa0 add warning messages on trajectory errors (+ ability to suppress) murrayrm Jun 5, 2024 https://github.com/python-control/python-control/pull/1001/commits/1b71fa00ebca08af89f6f96074f89b9b1e4b96b4
ab3b498 tweak arrow placement in _add_arrows_to_line2D murrayrm Jun 6, 2024 https://github.com/python-control/python-control/pull/1001/commits/ab3b4984a68ddc08d3742e9715c6283fa57ccff1
44ccafb add invpend example from Caltech CDS 110 murrayrm Jun 8, 2024 https://github.com/python-control/python-control/pull/1001/commits/44ccafbcd24574f92baa4aa165c3f58d1a798d8a
5d0450b change phase_plane_plot to use axes.set_title instead of fig.suptitle murrayrm Jun 8, 2024 https://github.com/python-control/python-control/pull/1001/commits/5d0450b246e7e1ad7067ece88c20da28f061230b
57e3e4e fix bug in the way dir=-1 arrows are handled at endpoint murrayrm Jun 8, 2024 https://github.com/python-control/python-control/pull/1001/commits/57e3e4efc8e1c7c676a642dc484352fc6b67a0ea
b34f72e using hanging indent for import (isort -m2) murrayrm Jun 8, 2024 https://github.com/python-control/python-control/pull/1001/commits/b34f72e5b4fb57af4f339f4005d7e099f76b2f02
d6432ca revert unneeded change on find_eqpt checks for arg lengths murrayrm Jun 8, 2024 https://github.com/python-control/python-control/pull/1001/commits/d6432ca74be0340bb98ffb461b09b33ff1fbce86
c72fa91 final tweaks of arrow code murrayrm Jun 8, 2024 https://github.com/python-control/python-control/pull/1001/commits/c72fa915408591197dd49cd1696a1ea42513722a
951e171 updates to address @slivingston review comments murrayrm Jun 26, 2024 https://github.com/python-control/python-control/pull/1001/commits/951e17126e589fd1744a4dd77243fb5189109ade
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https://github.com/python-control/python-control/pull/1001/files#diff-5ae9b973ef43076c51927f314e400ffc76cef00009ba1f343c83c53bd12a9d99
https://github.com/python-control/python-control/pull/1001/files#diff-5ae9b973ef43076c51927f314e400ffc76cef00009ba1f343c83c53bd12a9d99
https://github.com/python-control/python-control/pull/1001/files#diff-5ae9b973ef43076c51927f314e400ffc76cef00009ba1f343c83c53bd12a9d99
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