# Generalized Schur Decomposition with sparse matrices?

**URL:** <https://discourse.julialang.org/t/generalized-schur-decomposition-with-sparse-matrices/30901>\
**Category:** New to Julia\
**Created:** [November 9, 2019, 9:51pm UTC](https://discourse.julialang.org/t/generalized-schur-decomposition-with-sparse-matrices/30901 "2019-11-09T21:51:19Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![qwerytyui1234](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/qwerytyui1234/32/31952_2.png) [@qwerytyui1234](https://discourse.julialang.org/u/qwerytyui1234)\
**Post date:** [November 9, 2019, 9:51pm UTC](https://discourse.julialang.org/t/generalized-schur-decomposition-with-sparse-matrices/30901/1 "2019-11-09T21:51:19Z")

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Hey guys,

so I’m trying to use generalized schur decomposition, but with large sparse matrices.

I know I can use schurfact(A,B) in the LinearAlgebra package, but it seems that it does not allow for sparse matrices.

I found qr function that does QR decomposition in SuiteSparse.jl, but I was wondering if anybody knew of QZ decompositions?

I am completely fine by using the one in the LinearAlgebra package, but I was just curious!

Thanks!

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**Author:** ![rveltz](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rveltz/32/2707_2.png) [@rveltz](https://discourse.julialang.org/u/rveltz)\
**Post date:** [November 10, 2019, 9:30am UTC](https://discourse.julialang.org/t/generalized-schur-decomposition-with-sparse-matrices/30901/2 "2019-11-10T09:30:51Z")

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There is Schur factorization in `KrylovKit.jl`, not the generalized one though.