News.md

BifurcationKit.jl, Changelog

All notable changes to this project will be documented in this file (hopefully). No performance improvements will be notified but mainly the addition of new methods, the modifications of internal structs, etc.

[0.4.2]

• change bordered linear solvers' interface
• record_from_solution has been changed to the following definition

[0.4.0]

• Setfield.jl is not anymore the main component of BifurcationKit to support parameter axis. It has been changed in favour of Accessors.jl

[0.3.7]

• remove Requires.jl and use extensions. This requires julia>=1.9

[0.3.5]

• add field save_solution to BifurcationProblem. Allows to save problem state along with the current solution. Useful for periodic orbits for example where we can save the phase condition and the mesh when the latter is adapted.

[0.3.4]

• add function _keep_opts_cont to filter continuation options
• order 2 prediction for periodic orbit from Hopf bifurcation
• add jacobian(Π::PoincaréMap{ <: WrapPOSh }, x, pars)
• hasstability becomes _hasstability
• getvectortype becomes _getvectortype
• add condensation of parameters, great speedup for collocation of periodic orbits
• add in_bisection field in struct ContState
• allow to do codim 2 continuation of PO with collocation and mesh adaptation
• update_section_every_step becomes a UInt
• add fields in PeriodDoublingProblemMinimallyAugmented and NeimarkSackerProblemMinimallyAugmented for holding Resonance test values
• add specific finalizer for Fold of PO when using Collocation or shooting
• add struct FinalisePO
• update_minaug_every_step = 1 by default for Hopf / Fold continuation
• update_minaug_every_step = 1 is default for for PD / NS continuation

[0.2.8] - 2023-05-18

• add getDelta to the interface of AbstractFlow
• remove finDiffEps from ContinuationPar.

[0.2.8] - 2023-04-23

• use jvp function name in Flow interface
• add radius to section of Poincare Shooting
• add _mesh field to reconstruct POColl problem (adapted mesh) from previous solution
• add new jacobian parametrization using structs instead of Symbol
• remove θ from ContinuationPar

[0.2.8] - 2023-04-17

• add delta keyword to BifurcationProblem constructor

MISSSINF

[0.2.0] - 2022-07-23

• new interface based on the problem BifurcationProblem

[0.1.8] - 2021-12-12

• switch from DiffEqBase to SciMLBase
• change function name closesttozero to rightmost

[0.1.8] - 2021-11-27

• ⛳️ add a new interface for Flows
• add custom distance for DeflationOperator
• add possibility to use forward diff (AD) with deflation operator

[0.1.8] - 2021-11-20

• the method for periodic orbits getM becomes getMeshSize

[0.1.7] - 2021-11-6

• add abstract types AbstractDirectLinearSolver and AbstractIterativeLinearSolver
• the function getTrajectory becomes getPeriodicOrbit
• add struct SolPeriodicOrbit to allow for unified plotting interface with all methods for computing periodic orbits
• ⛳️ the keyword argument linearPO is renamed into jacobianPO
• add newton / continuation methods for TWProblem
• add GEigArpack generalized eigensolver

[0.1.5] - 2021-10-23

• remove documentation from package, it is now located in BifurcationKitDocs.jl

[0.1.5] - 2021-10-16

• change function name problemForBS into reMake for aBS of periodic orbits
• add function generateSolution to generate guess for computing orbits from a function solution t -> orbit(t)
• ⛳️ add orthogonal collocation method for periodic orbits
• add additional method for computing Floquet multipliers based on generalized eigenvalue problem

[0.1.5] - 2021-09-26

• add new problem for symmetries TWProblem

[0.1.5] - 2021-09-25

• add example for wave computation

[0.1.5] - 2021-09-25

• refactoring, extractTimeSlices becomes getTimeSlices

[0.1.5] - 2021-09-05

• add a simple callback to limit residuals in Newton iterations cbMaxNorm
• ⛳️ add branch switching for branches of PO at BP / PD
• auto generate more tutorials

[0.1.5] - 2021-07-18

• rename get3Jet into getJet
• remove BlockArrays.setblock! occurrences which are deprecated

[0.1.5] - 2021-07-10

• add perturbGuess option to multicontinuation
• change option printSolution to recordFromSolution in continuation and similar functions

[0.1.5] - 2021-06-26

• add new function getFirstPointsOnBranch to allow fine grained control of aBS
• add full automatic differentiation for Deflated Problems

[0.1.5] - 2021-06-20

• ⛳️ add computing full transcritical/pitchfork branch (not half) in bifurcationDiagram

[0.1.4] - 2021-06-06

• move toward automatic generation of docs with figures
• add applytoX, applytoY option to plotting

[0.1.4] - 2021-05-30

• add function get3Jet to compute Taylor expansion
• getLensParam becomes getLensSymbol
• add detection of codim 2 singularities

[0.0.1] - 2021-05-16

• rename HopfBifPoint -> Hopf
• rename GenericBifPoint into SpecialPoint and bifpoint to specialpoint
• add applytoY keyword to plot recipe

[0.0.1] - 2021-05-9

• remove p->nothing as default argument in continuationHopf
• add bordered linear solver option in newtonHopf

[0.0.1] - 2021-05-2

• remove type piracy for iterate
• put the computation of eigenvalues in the iterator
• correct mistake in bracketing interval in locateBifurcation!
• remove GMRESIterativeSolvers! from linearsolvers

[0.0.1] - 2021-04-3

• correct bug in the interval locating the bifurcation point (in bisection method)

[0.0.1] - 2021-01-24

• ⛳️ add bothside kwargs to continuation to compute a branch on both sides of initial guess
• update the Minimally augmented problem during the continuation. This is helpful otherwise the codim 2 continuation fails.
• [WIP] detection of Bogdanov-Takens and Fold-Hopf bifurcations
• remove field foldpoint from ContResult

[0.0.1] - 2020-11-29

• improve bordered solvers for POTrap based on the cyclic matrix

[0.0.1] - 2020-11-7

• ⛳️ update phase condition during continuation for shooting problems and Trapezoid method

[0.0.1] - 2020-11-7

• remove fields n_unstable, n_imag and stability from ContResult and put it in the field branch.

[0.0.1] - 2020-10-25

• the keyword argument Jt for the jacobian transpose is written Jᵗ

[0.0.1] - 2020-9-18

• new way to use the argument printSolution in continuation. You can return (Named) tuple now.

[0.0.1] - 2020-9-17

• add new type GenericBifPoint to record bifurcation points and also an interval which contains the bifurcation point
• add kwargs to arguments finaliseSolution
• add kwargs to callback from newton. In particular, newton passes fromNewton=true, newtonPALC passes fromNewton = false
• save intervals for the location of bifurcation points in the correct way, (min, max)

[0.0.1] - 2020-9-16

• better estimation of d2f/dpdx in normal form computation
• change of name HyperplaneSections -> SectionPS for Poincare Shooting

[0.0.1] - 2020-9-12

• clamp values in [pMin, pMax] for continuation
• put arrow at the end of the branch (plotting)

[0.0.1] - 2020-9-6

• add eta parameter in ContinuationPar
• change name PALCStateVariables into ContState and PALCIterable into ContIterable
• ⛳️ add Deflated Continuation

[0.0.1] - 2020-8-21

• ⛳️ add Multiple predictor (this is needed to implement the pmcont algorithm from pde2path (Matlab)

[0.0.1] - 2020-7-26

• ⛳️ add Polynomial predictor

[0.0.1] - 2020-7-19

• ⛳️ add Branch switching for non-simple branch points

[0.0.1] - 2020-7-9

The package is registered.

[0.0.1] - 2020-6-20

Deprecated

• Rename option ContinuationPar: saveSolEveryNsteps --> saveSolEveryStep
• Rename option ContinuationPar: saveEigEveryNsteps --> saveEigEveryStep
• Rename option ContinuationPar: plotEveryNsteps --> plotEveryStep

[0.0.1] - 2020-6-10

• change the name of the package into BifurcationKit.jl

Deprecated

• The options computeEigenvalue in ContinuationPar has been removed. It is now controlled with detectBifurcation.

[0.0.1] - 2020-5-2

Added

• ⛳️ automatic branch switching from simple Hopf points
• ⛳️ automatic normal form computation for any kernel dimension

[0.0.1] - 2020-4-27

Added

• ⛳️ automatic branch switching from simple branch points (equilibrium)
• ⛳️ automatic normal form computation