This release introduces several new features as well as bug fixes and documentation improvements:

• Improved default time vector for time response functions (bnavigator, sawyerbfuller)
• New use_legacy_defaults function to allow compatibility with previous versions (sawyerbfuller)
• Allow creation of non-proper transfer functions (bnavigator, rlegnain)
• Added ability to set arrow head length and width option in nyquist_plot (geekonloose)
• Added ability to 'prewarp' the conversion of continuous to discrete-time systems (sawyerbfuller)
• Added rlocus capability for discrete-time systems (sawyerbfuller)
• Updated pzmap grid to be compatible with matplotlib updates (bnavigator)
• Implement loadable string representation (repr) for tf, ss, and frd (repagh)
• Fixed margin computation for discrete time systems (bnavigator)
• Fixed indexing bug in bdalg.connect (sawyerbfuller)
• Fixed InterconnectedSystem naming bugs, improved conventions (samlaf)
• Fixed LinearIOSystem output bug in output function (francescoseccamonte)
• Fixed bug in forced_response that overrode squeeze parameter (bnavigator)
• Use rad/sec for Bode plot in MATLAB bode (was erroneously defaulting to Hertz) (paulvicioso)
• Removed deprecated scipy calls and updated to latest numpy (bnavigator)
• Multiple documentation updates (bnavigator, laurensvalk)
• New and improved examples for sisotool, pvtol (repagh, samlaf)
• The rlocus function no longer automatically creates a new figure
• Updated unit tests + switch to pytest (bnavigator, sawyerbfuller)
• Return type for eigenvalues in lqe changed to 1D array (matches lqr)
• Small fixes + documentation updates to markov

More info:

• Full list of merged pull requests associated with this release.
• Full list of commits associated with this release