# How to find the determinant or condition number of the stiffness matrix?

**URL:** <https://community.freefem.org/t/how-to-find-the-determinant-or-condition-number-of-the-stiffness-matrix/1506>\
**Category:** General Discussion\
**Created:** [February 19, 2022, 5:37am UTC](https://community.freefem.org/t/how-to-find-the-determinant-or-condition-number-of-the-stiffness-matrix/1506 "2022-02-19T05:37:46Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![jcvillaquira](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/jcvillaquira/32/2016_2.png) [@jcvillaquira](https://community.freefem.org/u/jcvillaquira)\
**Post date:** [May 5, 2024, 2:03am UTC](https://community.freefem.org/t/how-to-find-the-determinant-or-condition-number-of-the-stiffness-matrix/1506/23 "2024-05-05T02:03:50Z")

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How can one save it in a variable?

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**Author:** ![prj](https://avatars.discourse-cdn.com/v4/letter/p/ecae2f/32.png) [@prj](https://community.freefem.org/u/prj)\
**Post date:** [May 5, 2024, 6:00am UTC](https://community.freefem.org/t/how-to-find-the-determinant-or-condition-number-of-the-stiffness-matrix/1506/24 "2024-05-05T06:00:04Z")

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It’s not possible to this date, though a slight modification of the PETSc plugin could allow one to access the function [MatMumpsGetCntl — PETSc v3.21.1-112-gb1d24acd23d documentation](https://petsc.org/main/manualpages/Mat/MatMumpsGetCntl/).

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