v1.9.0

ControlSystems v1.9.0

Diff since v1.8.2

Merged pull requests:

• more coverage (#893) (@baggepinnen)
• bump compat poly v4 (#899) (@baggepinnen)
• Convert pid parameters to :parallel (#900) (@mzaffalon)
• Add exact frequency-domain translation of discrete systems to continuous time (#902) (@baggepinnen)
• add tutorial analyzing hybrid systems (#903) (@baggepinnen)

Closed issues:

• Gamma contour in Nyquist plot (#796)
• pid with zero proportional gain (#897)
• ControlSystemsBase blocking Polynomials.jl v4 (#898)

v1.8.2

ControlSystems v1.8.2

Diff since v1.8.1

Merged pull requests:

• try activating coverage for subpackage (#763) (@baggepinnen)
• add section on dealing with model uncertainty in tutorial (#884) (@baggepinnen)
• Upper-bound length of default time vector (#887) (@baggepinnen)
• depend on StaticArraysCore instead of StaticArrays (#888) (@baggepinnen)
• add more emphasis on model uncertainty in tutorial (#889) (@baggepinnen)
• Fix append for delay system (#892) (@baggepinnen)
• remove duplicated file (#894) (@baggepinnen)
• better error message in lsim (#895) (@baggepinnen)
• add method to DSP.filt and filtfilt (#896) (@baggepinnen)

Closed issues:

• bodeplot does not work well with plotlyjs backend (#875)
• append on DelayLtiSystem does not works (#879)
• OutOfMemoryError on step without time step size (#880)
• named transfer functions (#885)
• minreal returns system of order 21 instead of order 5. (#890)
• add tolerance to tzeros (#891)

v1.8.1

ControlSystems v1.8.1

Diff since v1.8.0

Merged pull requests:

• remove automatic field propagation from balance_statespace (#863) (@baggepinnen)
• truncate T in baltrunc (#864) (@baggepinnen)
• add functions to check controllability/observability using the PHB test (#866) (@baggepinnen)
• fix rendering of some equations systems (#868) (@baggepinnen)
• use correct gain type in zpk with length 0 numerator (#870) (@baggepinnen)
• fix transfer function colon indexing (#872) (@baggepinnen)
• fix unwrapping option in bodeplot (#874) (@baggepinnen)
• safe dtmax in continuous lsim (#876) (@baggepinnen)
• fix DelaySS conversion with special number type (#878) (@baggepinnen)
• Incorporate changes from #344 (#881) (@KronosTheLate)
• add tutorial on controller tuning from experimental data (#883) (@baggepinnen)

Closed issues:

• SisoZpk and SisoRational constructors called multiple times from zpk and tf (#387)
• Rendering of state space equations in documentation (#867)
• no method matching zpk for step (#869)
• Using : for indexing does not works on TransferFunction (#871)
• c2d not working with method input (#873)
• change to ControlSystems dosent work for import pkg (#877)

v1.8.0

ControlSystems v1.8.0

Diff since v1.7.4

Closed issues:

• ssdata & storage format of systems? (#857)

Merged pull requests:

• make schur factorization differentiable (#849) (@baggepinnen)
• fix typos (#858) (@spaette)
• add linearization utility (#859) (@baggepinnen)
• Always draw up to Nyquist frequency for discrete systems (#860) (@baggepinnen)
• add option to design observers with direct term (#861) (@baggepinnen)
• add discretization of cost and covariance matrices (#862) (@baggepinnen)

v1.7.4

ControlSystems v1.7.4

Diff since v1.7.3

Closed issues:

• Allow place to handle multi input systems (#384)
• zpk view of NamedStateSpace structure (#845)
• sigmaplot -- possible to just plot largest and smallest singular values? (#846)

Merged pull requests:

• add differentiable versions of are and hinf (#844) (@baggepinnen)
• handle Int in conversion to tf (#847) (@baggepinnen)
• allow plotting of only largest and smallest sigmas (#848) (@baggepinnen)
• simplify AD examples (#850) (@baggepinnen)
• Make continuous-time lyapunov solver differentiable (#851) (@baggepinnen)
• optimize performance of balance_statespace (#852) (@baggepinnen)
• make PD lyap solver differentiable (#853) (@baggepinnen)
• Implementation of place for MIMO systems (#854) (@baggepinnen)
• remove wrong imports (#855) (@baggepinnen)

v1.7.3

ControlSystems v1.7.3

Diff since v1.7.2

Closed issues:

• Polynomials with very small coefficients gets rounded to 0 (#123)
• lsim not working for systems that are not strictly proper (#195)
• iscontinuous function not found (#199)
• Adjustment to dlqr and dlyap (#222)
• Non-positive Ts for continuous types (#447)
• Converting "identity" transfert function with ss results in BoundsError (#828)
• delay*tf being recognized as improper even if it is not. (#830)
• Julia v1.9: ControlSystems/-MTK error message (#834)
• minreal works -- but gives "wrong" result (#835)
• bodeplot... is the magnitude given in dB? (#839)

Merged pull requests:

• handle breaking change in Polynomials (#829) (@baggepinnen)
• better error message for improper delay conversion (#831) (@baggepinnen)
• remove instance with h where it should be Ts (#832) (@albheim)
• apply numerical balancing before plotting (#836) (@baggepinnen)
• make balance_statespace work for more system types (#837) (@baggepinnen)
• add precompilation workload (#838) (@baggepinnen)
• optimize performance of sigma (#840) (@baggepinnen)
• try harder to return the correct type from matrix comps (#841) (@baggepinnen)
• add AD to lqr opt (#842) (@baggepinnen)
• Add interface to DSP (#843) (@baggepinnen)

v1.7.2

ControlSystems v1.7.2

Diff since v1.7.1

Closed issues:

• wrong frequency response of systems with delay (#824)

Merged pull requests:

• add note on how to obtain Riccati solution to docstring (#821) (@baggepinnen)
• Autolqr (#822) (@baggepinnen)
• add simple robustness analysis (#823) (@baggepinnen)
• add more examples to time response (#825) (@baggepinnen)
• Update Project.toml (#826) (@baggepinnen)

v1.7.1

ControlSystems v1.7.1

Diff since v1.7.0

Merged pull requests:

• fix import warnings (#820) (@baggepinnen)

v1.7.0

ControlSystems v1.7.0

Diff since v1.6.1

Closed issues:

• ControlSystemIdentification and ControlSystems failed to precompile in Julia 1.8.5 (#812)
• feedback_control causes a stackoverflow on DelayLtiSystem (#815)

Merged pull requests:

• Charpoly computation improved (#804) (@stepanoslejsek)
• use inplace exp! to save allocs (#806) (@baggepinnen)
• apply statespace balancing in pid constructor (#807) (@baggepinnen)
• add notes on linearizing dynamics using AD (#808) (@baggepinnen)
• Fixes for c2d for polynomials (#809) (@baggepinnen)
• Add ControlSystemsBase compat for Polyester 0.7 (#810) (@jaakkor2)
• fix tests for nightly (#813) (@baggepinnen)
• Missing backticks (#814) (@mzaffalon)
• prevent stackoverflow on feedback with kwargs (#816) (@baggepinnen)
• improve feedback docs (#818) (@baggepinnen)
• add system_name function and use in plots (#819) (@baggepinnen)

v1.6.1

ControlSystems v1.6.1

Diff since v1.6.0

Closed issues:

• Docstrings for Bode and Nyquist plot functions specify incorrect indexing (#797)
• marginplot + setPlotScale("dB") = no magnitude plot (#798)

Merged pull requests:

• fix pid with Ts keyword (#755) (@baggepinnen)
• Use yscale --> _PlotScaleFunc in some plot recipes (#799) (@baggepinnen)
• warn more against high-order transfer functions (#800) (@baggepinnen)
• handle Infinite delay margins (#801) (@baggepinnen)
• plot the phase guide at the correct phase (#802) (@baggepinnen)
• add stepinfo (#803) (@baggepinnen)
• relax some conversion signatures (#805) (@baggepinnen)