Most important changes:

• tf: Improve accuracy of transfer function from state space models
  by reusing an own version of the SLICOT function TB01ZD, which was
  removed in release 4.0.0
• connect: Added examples in the help text
• hinfsyn: check for more assumptions before calling SLICOT routine
• sgrid: fixed resizing (issue #15) and improved zeta-values for automatic selected lines of constant damping (bug #60972)
• build system: removed tests for old is_numeric (and similar) symbols (issues #18 and #21).

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.

Most important changes:

• estim: new input argument type for a delayed or current version of a discrete-time estimator using last or current output measurements for current state estimation
• kalman: adding type input argument for discrete-time filters (see estim), consistent default values for input arguments
• added more test, like, e.g. estim, kalman and ssdata
• hinfsyn: more comprehensive help text
• margin: fix of wrong phase margin if outside +/- 180 degree
• rlocusx: improved colors

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.

Most important changes:

• more robust test in impulse and cfconred
• fix possibly missing deprecated LAPACK routine DGEGS
• input parameter checking for NaN and Inf in oct-files in order to prevent Octave from hanging (bug #66669)
• ss: state space from MIMO transfer function 'tfsys' numerically more robust (bug #66651)
• lyap (A,Q) also for non-symmetric Q (bug #66567)
• fix time responses (step, impulse, ...) if requested for multiple systems and on Octave versions prior to Octave 8
• minor fixes in the build system

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.

Most important changes:

• lqg, lqgtrack, lqgreg, reg: new functions for linear dynamic output feedback design including estimator and state feedback
• lqry, lqi: new linear quadratic regulator design function, output weighting and with integral part
• c2d: impulse invariant discrete-time models for MIMO systems and state space representations
• New algorithm for imp_invar, also allowing MIMO systems
• tfdata: returning coefficient lists of same length for numerator and denominator (bug #43947)
• allow time responses (like, e.g. stepor impulse) for several systems with different sizes

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.

Most important changes:

• warning messages do not include trace information anymore
• mktito: changed name of inputs and outputs for compatibility (bug #63736)
• more robust test using Markov parameters for several model reduction routines (bug #65218)
• fix graphic styles in pzmap (bug #57716)
  -doc_control ('license') displays license and copyright information

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.

Most important changes:

• Use current version of the SLICOT-Reference routines v5.8 from Github
• Fixed phase in bode plot for system with poles/zeros at the origin (credits to Juan, see bug #61355, comment #10
• Fixed duration of time responses like step for systems with oscillations and improved graphical output

Please note: The source archives Source code (zip) and Source code (tar.gz) are automatically added to the release's assets by Github and do not contain the complete sources since this project uses submodules for the SLICOT library. All sources that are required for installing the control package in GNU Octave are included in the downloadable archive file control-x.y.z.tar.gz. The complete sources (including, e.g., the ones for packaging) are available in the repository which has to be cloned using the option --recurse-submodules.

fix bug #64374: numeric constants are converted into proper lti systems before being interconnected to discrete time-systems

• zgrid: new function for grid lines with constant eigenfrequency and damping for discrete-time pole/zero maps
• pzamp: added unit circle (for discrete-time) systems and axes to the pole/zero maps
• allow discrete-time purely static gain systems with a sampling time
• added metainfo file octave-control.metainfo.xml

• fix build errors when installing in Octave 6

• fix build errors when installing in Octave 9
• more robust tests for some model reduction and identification functions