# Symmetric matrices

**URL:** <https://discourse.julialang.org/t/symmetric-matrices/4086>\
**Category:** General Usage\
**Tags:** proposal, performance, linearalgebra, matrices\
**Created:** [June 4, 2017, 11:33pm UTC](https://discourse.julialang.org/t/symmetric-matrices/4086 "2017-06-04T23:33:18Z")\
**Posts on this page:** 1\
**Showing post:** 9

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**Author:** ![Ralph\_Smith](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/ralph_smith/32/10344_2.png) [@Ralph\_Smith](https://discourse.julialang.org/u/Ralph_Smith)\
**Post date:** [June 6, 2017, 2:52am UTC](https://discourse.julialang.org/t/symmetric-matrices/4086/9 "2017-06-06T02:52:10Z")

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For some operations (esp. Cholesky and triangular solves) LAPACK has routines for **rectangular full packed** format (newer than the format @nalimilan and @stevengj address above), which

> enables the use of half the full storage while maintaining efficiency by using Level 3 BLAS/LAPACK kernels.

(detaiils [here](http://www.netlib.org/lapack/lapack-3.2.html), about haflway down the page).

If these capabilities fit the bill, the price to be paid is in developer time.

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