Provide inv and det of Tridiagonal and SymTridiagonal matrices #5358
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Also specialize det(Tridiagonal) method which calls LAPACK.gttrf!
| @@ -351,7 +420,7 @@ type LUTridiagonal{T} <: Factorization{T} | |||
| # end | |||
| end | |||
| lufact!{T<:BlasFloat}(A::Tridiagonal{T}) = LUTridiagonal{T}(LAPACK.gttrf!(A.dl,A.d,A.du)...) | |||
| lufact!(A::Tridiagonal) = lufact!(float(A)) | |||
| lufact!{T<:Integer}(A::Tridiagonal{T}) = lufact!(float(A)) | |||
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This excludes rational matrices, but I think we'll have LU implementations in julia soon, so maybe it doesn't matter.
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Besides the minor comment, I think this looks fine. |
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Yes, it would be irrational to leave out the |
jiahao
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Jan 12, 2014
Provide inv and det of Tridiagonal and SymTridiagonal matrices
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This PR provides fast methods for computing the inverse and determinant of Tridiagonal (and SymTridiagonal) matrices.