…trol

Add capability to check for unused signals in InterconnectedSystem;
this check is invoked by default by `interconnect`.

Ignore warnings with match string from conftest.py's `matrixfilter`
warning filter.

return frequency response for 0 and 1-state systems directly

ease test tolerance on timeseries

Use conda-forge for numpy and co.

…ane poles near imaginary axis are on imaginary axis

…correct order of return arguments in margin, typos and changed to ControlMIMONotImplemented error where needed.

* use plot_curve_magnitude to scale response at large magnitudes
* add new line styles of scaled points on the curve
* add points to contour near imaginary poles to avoid missing encirclements
* add offsets to primary/mirror curve at large amplitude to avoid overlap
* (still needs some unit tests, documention updates, and comparisons)

Clip closed-loop contour labels.

Add labels for constant closed-loop phase contours.

Use smaller of data or view extents when deciding on how big, in
phase, a chart to create.

Use more uniformly spaced closed-loop phase contours, and use more
widely-spaced contours when phase extent is large.

Add optional `ax` argument, for axes to add grid to.

* changed return type for poles() and zeros() to complex
* updated (missing) discrete-time tests for stability warnings
* changed processing of near imaginary poles to pure imaginary poles

Bug fix and improvements to Nyquist plots

linfnorm requires Slycot routine ab13dd, which does the actual work.

Added tests to check that wrapping of ab13dd is correct, that static
systems are handled, and that discrete-time system frequencies are
scaled correctly.

…extent

ENH: add `linform` to compute linear system L-infinity norm

Improvements to Nichols chart plotting

add envs to gitignore

added binder link

update python-package-conda workflow to use conda instead of conda-forge

fix README.rst for twine