# \#cholmod

**URL:** https://discourse.julialang.org/tag/cholmod/1166.md

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## [Fixed-structure CHOLMOD with in-place \`set\_nonzeros!\`](https://discourse.julialang.org/t/fixed-structure-cholmod-with-in-place-set-nonzeros/130922)

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**Author:** [@luke-kiernan](https://discourse.julialang.org/u/luke-kiernan)\
**Replies:** 3\
**Last updated:** [July 22, 2025, 3:03am UTC](https://discourse.julialang.org/t/fixed-structure-cholmod-with-in-place-set-nonzeros/130922 "2025-07-22T03:03:22Z")

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I have a large sparse matrix. Its nonzeros change over the course of the problem, but its structure doesn’t. I want to do repeated in-place Cholesky factorizations, re-using the symbolic factorization and modifying the n…

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## [Help with SparseArrays/ChainRules error](https://discourse.julialang.org/t/help-with-sparsearrays-chainrules-error/99425)

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**Author:** [@ElOceanografo](https://discourse.julialang.org/u/ElOceanografo)\
**Replies:** 0\
**Last updated:** [May 26, 2023, 6:07am UTC](https://discourse.julialang.org/t/help-with-sparsearrays-chainrules-error/99425 "2023-05-26T06:07:01Z")

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Ran into this error running code similar to this MWE, and was hoping someone who knows more about the AD ecosystem could help point me where to file an issue–is this a missing ChainRule, or overly-strict typing in Sparse…

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## [From toy to production code with sparse matrix and sparse-direct factorizations](https://discourse.julialang.org/t/from-toy-to-production-code-with-sparse-matrix-and-sparse-direct-factorizations/89105)

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**Author:** [@Gravlax](https://discourse.julialang.org/u/Gravlax)\
**Replies:** 17\
**Last updated:** [November 1, 2022, 10:01pm UTC](https://discourse.julialang.org/t/from-toy-to-production-code-with-sparse-matrix-and-sparse-direct-factorizations/89105 "2022-11-01T22:01:25Z")

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Dear all, I would like to port a toy code that assembles one sparse matrix and solves one linear system of equation to a production code that assembles many sparse matrices and solves many systems of equation iterativel…