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

• New input/output systems module for creating nonlinear systems from individual I/O subsystems, with find_eqpt, input_output_response, and linearize functionality
• Initial implementation of differential flatness module for computing feasible trajectories for differentially flat (nonlinear) systems
• Preliminary version of lqe function (sawyerbfuller)
• New dict-based implementation of user-configurable package/module configuration parameters
• Added similarity transformation function
• Add 's' and 'z' variable support to tf()
• Fixed discrete time simulation time step issue
• Reordered Gang of Four plots to match FBS
• Check for symmetric matrices with machine precision (bnavigator)
• Changed root precision tolerance and imaginary detection in xferfcn._common_den (bnavigator)
• Fixed bug in timeresp.forced_response (adm78)
• Improved latex representation for exp format and multi-digit exponents of s or z (bnavigator)
• Renamed FRD class name FrequencyResponseData to fix MacOS sphinx build problems (FRD still defined for backward compatibility`
• Allow np.array or np.matrix for state space matrices, operations via use_numpy_matrix
• Improved detection of when to add additional points in root_locus
• Adaptive gain click criterion and zoom bug fix for root_locus (icam0)
• Improved code for ctrb and obsv (billtubbs)
• Documentation updates (bnavigator, murrayrm, roryyorke)
• Updated examples to be PEP compliant
• Improved unit tests (bnavigator, murrayrm), increased coverage to ~80%

More info:

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