# Solving block matrix system with factorized blocks

**URL:** <https://discourse.julialang.org/t/solving-block-matrix-system-with-factorized-blocks/78351>\
**Category:** General Usage\
**Tags:** linearalgebra\
**Created:** [March 23, 2022, 8:14pm UTC](https://discourse.julialang.org/t/solving-block-matrix-system-with-factorized-blocks/78351 "2022-03-23T20:14:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![jinml](https://avatars.discourse-cdn.com/v4/letter/j/91b2a8/32.png) [@jinml](https://discourse.julialang.org/u/jinml)\
**Post date:** [March 23, 2022, 8:14pm UTC](https://discourse.julialang.org/t/solving-block-matrix-system-with-factorized-blocks/78351/1 "2022-03-23T20:14:31Z")

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Is there are package that can construct a block matrix `A` with pre-factorized blocks, and make use of the factorization to solve `Ax=b`?  
`BlockArrays.jl` seems able to use `\` but not factorized blocks, `BlockFactorizations.jl` seems able to include factorized blocks, but no solvers or `inv` is defined.