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sssMOR - Changelog

A list of (major) changes between releases, as well as information about MATLAB versions used and toolbox dependencies. Sometimes we add also changes to come to our roadmap.

Roadmap (changes to come)

  • Second order models: direct reduction

v2.00 [06 September 2017]
Dependencies sss Toolbox
Programmed with MATLAB R2016b, R2015b, R2015a
Tested with MATLAB R2014a, R2015b, R2016b, R2017a
on Windows 7

New Features

  • DOCUMENTATION
    • added documentation files to a folder doc/ inside sssMOR. In this way, everybody can profit from the doc documentation of sssMOR, not just those who download the release version.
    • added p-Functions publishDoc.p and publishFunction.p to be able to update the documentation whenever headers are changed.
  • CPLXPAIRALL
    • added function to sort several arrays with respect to the sorting of the first input argument as of cplxpair
  • CRKSM
    • added a function to solve Lyapunov equations by means of cumulative rational Krylov subspace method
  • STABSEP
    • added an own function to separate an ustable model into a stable and antistable part. In addition to the built-in function, it returns also the projection matrices resulting in the submodels.
  • L2NORM
    • added function to compute the L2 norm of a dynamical system. This is especially interesting when dealing with unstable models where the H2-norm is undefined.

Changes

  • SSS
    • updated to v2.00
    • SSS is no more a submodule of sssMOR, hence it is not anymore in src/ folder. Instead, sss and sssMOR are now distributed independently and have to be both in the path for sssMOR to work.
  • SSRED
    • added load and save functions to the ssRed class
    • allowing conversion from sss or ss to ssRed objectsf
    • made the definition of ssRed objects easier, allowing also the definition of "userDefined" ssRed objects and the definition of arbitrary reduction parameters to be stored in the ssRed object
  • IRKA
    • allowing to call irka with a reduced order q instead of initial shifts and/or tangential directions
  • ARNOLDI, RK, IRKA, CIRKA, ...
    • added nLU as output argument to count the number of LU decompositions required by the reduction algorithms
  • CIRKA
    • added option to take only the stable subsystem of the model function
  • RKICOP
    • allowing matrix valued shifts as input (for MIMO models)
  • CURE
    • added as output argument a cell array of all reduced models at each step of the cumulative framework

v1.08 [02 Frebruary 2017]
Dependencies sss Toolbox
Programmed with MATLAB R2015b
Tested with MATLAB R2014b, R2015b, R2016b
on Windows 7, Ubuntu 16.04.1 LTS

Changes

  • TBR
    • changed the definition of the Cholesky (like) factors of the Gramians to unify the notation with the low-rank method. They are now lower triangular matrices (A=LL') as opposed to MATLAB's built-in notation.
  • CIRKA, MODELFCT, MODELFCTMOR
    • added functions for the H2-optimal reduction using the model function framework, which leads to significant speedup, especially for very large scale models.
  • ADDED EXTRAS
    • moments, isH2opt, getSylvester moved to extras
    • shiftVec factorized as own function
    • ismemberf2, getDesiredOutput added
  • SSS
    • updated to v1.03

Bugfixes

  • MODALMOR
    • invariant subspace is computed only using eigs due to its higher efficiency
  • TBR
    • checking for empty E matrix if model is ssRed
  • RK
    • checking for empty E matrix if model is ssRed

v1.07 [05 October 2016]
Dependencies sss Toolbox
Programmed with MATLAB R2015b
Tested with MATLAB R2014b, R2015b, R2016b
on Windows 7, Ubuntu 16.04.1 LTS

Changes

  • minor improvements in MODALMOR, TBR, CURE, SPARK
  • SSS toolbox: using v1.02

Bugfixes

  • SSRED
    • Adding hidden properties for system matrices to cope with changed ss-class definition after R2016a

v1.06 [16 September 2016]
Dependencies sss Toolbox
Programmed with MATLAB R2015b
Tested with MATLAB R2014b, R2015b, R2016b
on Windows 7, Ubuntu 16.04.1 LTS

Changes

  • APP

    • new functionality: plotting of impulse- and step-response

  • SSRED

    • new class for reduced state-space-models

  • SPARK

    • new output (reduced model, reduction with porkV or porkW)

  • ISRK

    • new function: iterative SVD-Rational Krylov Algorithm

  • RKOP

    • new function: determine optimal expansion point for Laguerre series

  • RKICOP

    • new function: Rational Krylov with an iteratively calculated optimal point

v1.05 [9 May 2016]
Dependencies sss Toolbox
Programmed with MATLAB R2015b
Tested with MATLAB R2014b, R2015b, R2016b
on Windows 7, Ubuntu 16.04.1 LTS

Changes

  • APP

  • New sssMOR app added

  • ARNOLDI

    • new outputs (matrices of Sylvester equation)
    • new input (Opts structure)
    • Opts.orth (1xMGS,2x MGS,DGKS)
    • Opts.dgksTol
    • Opts.reorth (1xMGS, qr)
    • Opts.real (0,'real')
    • Opts.krylov (cascaded krylov basis for SISO)
    • Opts.lse (sparse, full, hess) for solving linear systems of equations

  • RK

    • new outputs (matrices of Sylvester equation)
    • new input (Opts structure for arnoldi)

  • IRKA

    • new outputs (matrices of Sylvester equation)
    • new output (kIter)
    • Opts.suppressverbose for speed-up

  • MODALMOR

    • new output (dominance analysis values)
    • Opts.dominance: dominance analysis, most dominant eigenvalue reduction

  • TBR

    • Alternating Direction Implicit (ADI) functionality added using the M.E.S.S. toolbox
    • plot decay of hsv and ask user (if q not defined)

v1.00 - First Release [16 November 2015]
Dependencies sss Toolbox
Programmed with MATLAB R2015b
Tested with MATLAB R2014b, R2015b, R2016b
on Windows 7, Ubuntu 16.04.1 LTS