# \#blockdiagonals

**URL:** https://discourse.julialang.org/tag/blockdiagonals/1203.md

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

---

## [Block Diagonal Factorization Performance](https://discourse.julialang.org/t/block-diagonal-factorization-performance/112294)

<div class="topic-metadata">

**Author:** [@bmit](https://discourse.julialang.org/u/bmit)\
**Replies:** 1\
**Last updated:** [September 25, 2024, 1:28pm UTC](https://discourse.julialang.org/t/block-diagonal-factorization-performance/112294 "2024-09-25T13:28:08Z")

</div>

I’m looking to leverage the speedup that is possible by exploiting block diagonal structures during matrix factorization. Since I’m relying on existing code and inherent multiple dispatch, I need the solution to 1) use a…

---

## [Help on how to describe a Matrix used for 2D Finite Differences using BlockBandedMatrices.jl](https://discourse.julialang.org/t/help-on-how-to-describe-a-matrix-used-for-2d-finite-differences-using-blockbandedmatrices-jl/103086)

<div class="topic-metadata">

**Author:** [@Tomusz](https://discourse.julialang.org/u/Tomusz)\
**Replies:** 9\
**Last updated:** [August 25, 2023, 5:48pm UTC](https://discourse.julialang.org/t/help-on-how-to-describe-a-matrix-used-for-2d-finite-differences-using-blockbandedmatrices-jl/103086 "2023-08-25T17:48:46Z")

</div>

Some context I’m dealing with the solution of a Poisson Equation with structure: ∇ψ\[i, j\] = -ω\[i,j\] =\> (∂²ψ/∂x² + ∂²ψ/∂y²) = -ω\[i,j\] To represent the LHS, i’m using a Matrix that contains the coefficients used to calc…

---

## [Dependency Error :'(](https://discourse.julialang.org/t/dependency-error/90262)

<div class="topic-metadata">

**Author:** [@chelseas](https://discourse.julialang.org/u/chelseas)\
**Replies:** 2\
**Last updated:** [November 14, 2022, 10:05pm UTC](https://discourse.julialang.org/t/dependency-error/90262 "2022-11-14T22:05:14Z")

</div>

I am getting this error from my use of BlockDiagonals: ERROR: Unsatisfiable requirements detected for package BlockDiagonals \[0a1fb500\]: BlockDiagonals \[0a1fb500\] log: ├─BlockDiagonals \[0a1fb500\] has no known versions…