# How to calculate displacement of global data

**URL:** https://discourse.paraview.org/t/how-to-calculate-displacement-of-global-data/2559
**Category:** ParaView Support
**Created:** [September 13, 2019, 8:10pm UTC](https://discourse.paraview.org/t/how-to-calculate-displacement-of-global-data/2559 "2019-09-13T20:10:43Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![wascott](https://discourse.paraview.org/letter_avatar_proxy/v4/letter/w/8e8cbc/32.png) [@wascott](https://discourse.paraview.org/u/wascott)
#### Post date: [September 13, 2019, 8:10pm UTC](https://discourse.paraview.org/t/how-to-calculate-displacement-of-global-data/2559/1 "2019-09-13T20:10:44Z")

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From a user:

I have a global history of a displacement at a location in a model. I want to plot the difference between the displacement at this point and the displacement at a reference point. How do I do this?

Thanks  
Jay

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### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [September 16, 2019, 2:34am UTC](https://discourse.paraview.org/t/how-to-calculate-displacement-of-global-data/2559/2 "2019-09-16T02:34:15Z")

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Is that over time-steps ?

In any case this is definitely doable with a Python Calculator.