This package provides an overloaded
\ that work with hyperdual-valued arrays.
It uses the hyper dual type defined by the HyperDualNumbers.jl package. The idea is that for a hyperdual-valued matrix
its inverse is given by
Therefore, only the inverse of is required to evaluate the inverse of .
This package makes available a
HyperDualFactors type which containts the factors of and the non-real parts of , and overloads
factorize to create an instance of
HyperDualFactors, which can then be called with
\ to efficiently solve hyperdual-valued linear systems of the type .
This package should be useful for autodifferentiation of functions that use
Note that this package is the equivalent of the DualMatrixTools.jl package, but for hyperdual numbers instead of dual numbers.
Create your hyperdual-valued matrix
julia> M = A + ε₁ * B + ε₂ * C + ε₁ε₂ * D
julia> Mf = factorize(M)
\to solve systems of the type
M * x = b
julia> x = Mf \ b
In the context of iterative processes with multiple factorizations and forward and back substitutions, you may want to propagate hyperdual-valued numbers while leveraging (potentially) the fact the real part of the matrices to be factorized remains the same throughout.
This package provides an in-place
factorize, with a flag to update (or not) the factors.
Usage is straightforward.
factorize does not update the factors
julia> factorize(Mf, M) # only Mf.B, Mf.C, and Mf.D is updated
If you want to update the real-valued factors too, use
julia> factorize(Mf, M, update_factors=true) # The factors in Mf.Af are also updated
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