# Field relative to average per slice

**URL:** https://discourse.paraview.org/t/field-relative-to-average-per-slice/7726
**Category:** ParaView Support
**Created:** [July 30, 2021, 9:35am UTC](https://discourse.paraview.org/t/field-relative-to-average-per-slice/7726 "2021-07-30T09:35:24Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![the\_german\_squirrel](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/t/ee59a6/32.png) [@the\_german\_squirrel](https://discourse.paraview.org/u/the_german_squirrel)
#### Post date: [July 30, 2021, 9:35am UTC](https://discourse.paraview.org/t/field-relative-to-average-per-slice/7726/1 "2021-07-30T09:35:24Z")

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Hi,

I’d like to show the perturbation of a field (point array) relative to the average along one coordinate (or more precise: For each point, I want to compute the percentage perturbation of a parameter relative to the depth-average).

I’ve tried the calculator functionality but I don’t know how to get a 3-D output from there (I can only get the overall mean of the parameter, and not per depth slice).

Does anybody have an idea how to approach this?

Thanks!

 ![1cbece26093ae868749711aaa36b188a19d633b0](https://discourse.paraview.org/uploads/default/original/2X/0/0a80159f748bf154ba05523ac552826ccf1235ee.jpeg)