andreasvarga / matrixpencils.jl Goto Github PK
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License: MIT License
Matrix pencil manipulations using Julia
License: MIT License
Hello Andreas, hope you're doing well!
A user of ControlSystems.jl recently reported an error calling lsminreal
in Julia v1.9 running on Windows.
The error looks like this
(minreal
is a thin wrapper around MatrixPencils.lsminreal
)
I suspect the error stems from some manual management of the lapack installation in this package, a search came up with this line mentioning libblastrampoline explicitly
MatrixPencils.jl/src/lapackutil2.jl
Line 3 in 460e14a
Today, minreal works on Windows 11/ Julia v1.9. THANKS!
The result from minreal is, however, "wrong" -- or perhaps extremely sensitive to tolerances...
Here is my system eigenvalues -- I insert copyable matrices for the system below:
From physics, there should be 4 states (independent differential equations) and 2 algebraic equations.
A = [-6.537773175952662 0.0 0.0 0.0 -9.892378564622923e-9 0.0; 0.0 -6.537773175952662 0.0 0.0 0.0 -9.892378564622923e-9; 2.0163803998106024e8 2.0163803998106024e8 -0.006223894167415392 -1.551620418759878e8 0.002358202548321148 0.002358202548321148; 0.0 0.0 5.063545034365582e-9 -0.4479539754649166 0.0 0.0; -2.824060629317756e8 2.0198389074625736e8 -0.006234569427701143 -1.5542817673286995e8 -0.7305736722226711 0.0023622473513548576; 2.0198389074625736e8 -2.824060629317756e8 -0.006234569427701143 -1.5542817673286995e8 0.0023622473513548576 -0.7305736722226711]
B = [0.004019511633336128; 0.004019511633336128; 0.0; 0.0; 297809.51426114445; 297809.51426114445]
C = [0.0 0.0 0.0 1.0 0.0 0.0]
D = [0.0]
linsys = ss(A,B,C,D)
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Hi, I started sketching out a package for Rational Functions based on Polynomials. The code is here https://github.com/jverzani/PolynomialRatios.jl . I don't know if it is helpful to you, but I could replicate the RationalFunctions code you have and include the transfer function type as a subtype of AbtractRationalFunction
. Were I to do so, would I just include the methods you've defined in https://github.com/andreasvarga/DescriptorSystems.jl/blob/main/src/types/RationalFunction.jl or are there more elsewhere in the code base?
Polynomials.jl realeased a new major version a while back, and I'm currently facing some compatibility problems in our stack due to MatrixPencils not supporting this new version. Would it be possible to add compat for Polynomials v4?
The subfunction tgsyl! throw an exception while applying the function
fiblkdiag(A, E, missing, missing; fast=false, finite_infinite = true)
to the regular pencil
A = [-8.828446764485715e7 0.0 0.0 0.0 1.0 0.0; 0.0 -599202.6439090811 0.0 0.0 1.0 0.0; 0.0 0.0 -44599.09517911089 3.1081161629028176e6 2.0 0.0; 0.0 0.0 -3.1081161629028176e6 -44599.09517911089 0.0 0.0; 0.0 0.0 0.0 0.0 -1.0 0.0; 1.4376687293449677e10 33249.50029419384 29200.436106193243 22920.479599602455 -161.90134290419934 -1.0]
E = [1.0 0.0 0.0 0.0 0.0 0.0; 0.0 1.0 0.0 0.0 0.0 0.0; 0.0 0.0 1.0 0.0 0.0 0.0; 0.0 0.0 0.0 1.0 0.0 0.0; 0.0 0.0 0.0 0.0 0.0 0.0; 0.0 0.0 0.0 0.0 -1.8422498299893581e-6 0.0]
The same happens in the sylvsys function (package MatrixEquations) when computing the Weierstrass canonical form as in
http://www.control.isy.liu.se/research/reports/2004/2602.pdf
while using the fischur function for diagonalisation.
Do you have any suggestions for solving this problem?
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