# Q: FiniteDifferences | gradient of a 3D scalar array

**URL:** <https://discourse.julialang.org/t/q-finitedifferences-gradient-of-a-3d-scalar-array/64065>\
**Category:** Numerics\
**Tags:** question\
**Created:** [July 5, 2021, 7:22am UTC](https://discourse.julialang.org/t/q-finitedifferences-gradient-of-a-3d-scalar-array/64065 "2021-07-05T07:22:25Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![rafael.guerra](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rafael.guerra/32/216610_2.png) [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)\
**Post date:** [July 5, 2021, 11:06am UTC](https://discourse.julialang.org/t/q-finitedifferences-gradient-of-a-3d-scalar-array/64065/2 "2021-07-05T11:06:00Z")

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It seems that you have a scalar array but not a scalar function defined?  
If that is the case then check [this post](https://discourse.julialang.org/t/differentiation-without-explicit-function-np-gradient/57784) out.

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