# Matrix Free Differentiation

**URL:** <https://discourse.julialang.org/t/matrix-free-differentiation/107134>\
**Category:** General Usage\
**Tags:** cartesianindices\
**Created:** [December 4, 2023, 10:40pm UTC](https://discourse.julialang.org/t/matrix-free-differentiation/107134 "2023-12-04T22:40:51Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![stevengj](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/stevengj/32/71_2.png) [@stevengj](https://discourse.julialang.org/u/stevengj)\
**Post date:** [December 5, 2023, 8:42pm UTC](https://discourse.julialang.org/t/matrix-free-differentiation/107134/6 "2023-12-05T20:42:21Z")

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> [@RoyiAvital](#):
>
> What do you mean by [“ghost cells”]?

See e.g. [Arrays with periodic boundaries - #4 by stevengj](https://discourse.julialang.org/t/arrays-with-periodic-boundaries/4015/4)

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