v0.11.2

ControlSystems v0.11.2

Diff since v0.11.1

Closed issues:

• Minreal no longer works properly for Int systems (#127)
• Problems with minreal for StateSpace systems (#298)

Merged pull requests:

• use minreal from MatrixPencils (#574) (@baggepinnen)

v0.11.1

ControlSystems v0.11.1

Diff since v0.11.0

Closed issues:

• Delay systems: step plot and bode plot (#571)

Merged pull requests:

• Fb/delaysimfix (#572) (@baggepinnen)
• Fixes some test errors on julia v1.7 (#573) (@baggepinnen)

v0.11.0

ControlSystems v0.11.0

Diff since v0.10.1

Closed issues:

• Issues with struct_ctrb_obsv and sminreal (#409)
• c2d does not maintain type (#441)
• Input/output format of lsim (#469)
• Numerical stability issue with ss->zpk conversion? (#475)
• tf with symbolics does not print correctly (#503)
• Maybe a mistake to suggest using im for variable (#515)
• Error with minreal (#545)
• gangofseven bug (#546)
• Drop method = _issmooth(u) ? :foh : :zoh from lsim? (#558)

Merged pull requests:

• add controller function (#512) (@baggepinnen)
• more abstract statespaces (#521) (@baggepinnen)
• Return a result structure from lsim (#529) (@baggepinnen)
• return similarity transform from balreal (#530) (@baggepinnen)
• Move plot globals to runtests (#531) (@albheim)
• remove incorrect warning in pzmap (#535) (@baggepinnen)
• change formatting in dampreport (#536) (@baggepinnen)
• support hz keyword in sigmaplot similar to bodeplot (#537) (@baggepinnen)
• add additive identity element for statespace and TF (#538) (@baggepinnen)
• bugfix for negative real pole in damp (#539) (@baggepinnen)
• Fix struct_ctrb_obsv (#540) (@baggepinnen)
• Yet another fix for struct_ctrb_states (#541) (@baggepinnen)
• optional epsilon in dcgain (#548) (@baggepinnen)
• bugfix: use correct type for saving dde solutions (#549) (@olof3)
• bugfix dcgain (#551) (@baggepinnen)
• correct type of initial state in step (#553) (@baggepinnen)
• remove version checks (#555) (@albheim)
• write struct_ctrb_states in terms of iszero instead of == 0 (#557) (@baggepinnen)
• remove issmooth (#561) (@baggepinnen)
• pole->poles tzero->tzeros (#562) (@baggepinnen)
• remove LQG (#564) (@baggepinnen)
• Dev (#565) (@baggepinnen)
• Releasenotes (#566) (@baggepinnen)
• filter one more line after warning (#567) (@baggepinnen)
• Doctestfix (#568) (@baggepinnen)
• Bump version (#569) (@baggepinnen)

v0.10.1

ControlSystems v0.10.1

Diff since v0.10.0

Closed issues:

• Update compats (#527)

v0.10.0

ControlSystems v0.10.0

Diff since v0.9.2

Closed issues:

• More autovec functions (#333)

Merged pull requests:

• Implement luenberger (#457) (@tfoliva)
• feat: add prescale(sys::StateSpace) and corresponding test. (#464) (@tfoliva)

v0.9.2

ControlSystems v0.9.2

Diff since v0.9.1

Merged pull requests:

• Loosen c2d system type from StateSpace to AbstractStateSpace (#455) (@imciner2)

v0.9.1

ControlSystems v0.9.1

Diff since v0.9.0

Closed issues:

• Using zpk with complex poles requires specific order for conjugates (#369)
• Error in damp(sys) if system is discrete (#450)

Merged pull requests:

• Add function to order conjugate pairs in zpk constructor (#386) (@albheim)
• Fix docstrings for plots (#442) (@albheim)
• New method for feedback2dof (#449) (@baggepinnen)
• Fix damp according to #450 (#451) (@albheim)
• CompatHelper: bump compat for "Polynomials" to "2.0" (#454) (@github-actions[bot])

v0.9.0

ControlSystems v0.9.0

Diff since v0.8.0

Closed issues:

• Multiplying 1x1 tf with mxn should result in elementwise multiplication? (#166)
• impulse/stepplot ignore keyword arguments (#345)
• Dataformat returned by bode and margin seems sub-optimal (#390)
• c2d doesnt work as expected for TransferFunction (#391)
• Simulator does not allow non-zero D matrix (#397)
• Migrate from Travis to Github Actions (#407)
• separate c2d function for returning x0map (#412)
• Custum labels for bodeplot (#415)

Merged pull requests:

• choose more sensible yticks for Phasediagram in Bodeplot (unconditionaly) (#272) (@freemin7)
• Force less options in plots (#286) (@baggepinnen)
• Bugfix for ssrand. (#302) (@olof3)
• LQG overhaul (#332) (@baggepinnen)
• Let impulse handle it's own args (#346) (@baggepinnen)
• Implement forward euler for c2d and d2c (#364) (@baggepinnen)
• Create TagBot.yml (#365) (@baggepinnen)
• Correct legend in README plot (#366) (@baggepinnen)
• Make default frequency vector span larger (#368) (@baggepinnen)
• Correct length of time vector for matrix u (#370) (@baggepinnen)
• Delete REQUIRE file (#371) (@albheim)
• Improve docstring of balance (#374) (@baggepinnen)
• Bugfix in getLogTicks (#375) (@baggepinnen)
• Manual specification of model order in baltrunc (#380) (@baggepinnen)
• Update autovec and add more functions (#388) (@albheim)
• Add Manifest.toml to .gitignore (#389) (@albheim)
• Fix issue #391 (#392) (@mfalt)
• removed multiplication sign in tf print (#393) (@mfalt)
• Update promotion (#394) (@baggepinnen)
• Fix Simulator blocking non-zero D (#398) (@albheim)
• allow specification of Tf instead of time vector in lsim (#403) (@baggepinnen)
• Remove require file from test (#404) (@albheim)
• Fix sign in lqr and dlqr docstrings (#405) (@adrhill)
• Add dlqr method for StateSpace input (#406) (@adrhill)
• Switch to github actions (#408) (@albheim)
• Remove matrix size from StateSpace types (#411) (@baggepinnen)
• Prevent error in complicated subplot layouts (#414) (@baggepinnen)
• Modify LQG speed control of DC motor example (#418) (@obrusvit)
• more robust gangoffour and gofplot (#424) (@baggepinnen)
• drop 1.0 support and make v1.3 the minimum supported version (#425) (@baggepinnen)
• correct formatting in docstrings (#426) (@baggepinnen)
• add some tests for pid design (#427) (@baggepinnen)
• add tests for pole placement design (#428) (@baggepinnen)
• activate pid design tests (#429) (@baggepinnen)
• add test for gofplot(G::LQG) (#430) (@baggepinnen)
• Testmargin (#431) (@baggepinnen)
• update news entries (#432) (@baggepinnen)
• add plots to docs (#433) (@baggepinnen)
• WIP: C2d single returnval (#436) (@olof3)

v0.8.0

News:

• [breaking] stepplot, lsimplot, impulseplot now have the same signatures as their corresponding non-plotting functions.
• New function d2c (inverse of c2d).
• New method :fwdeuler for c2d (and d2c).
• Styles of plots will now use the current default theme set in Plots instead of a custom style.
• The controller function in lsim can now return a scalar if the system has a single input.
• Bugfixes

v0.7.0

This version introduces a new type TimeEvolution to represent what was previously called Ts, i.e., the sample time for a discrete system or continuous (previously indicated by Ts = -1. You can still access the sample time for a discrete systems with the property .Ts.

This new type is part of the type definition of LTIsystems, i.e., the full type of a state-space object is now on the form

julia> ss(1)
StateSpace{Continuous,Int64,Array{Int64,2}}
D = 
 1

Continuous-time state-space model

Some new functions:

• timeevol(Lti) -> TimeEvolution (not exported)
• isdiscrete