# Plot Data

**URL:** https://discourse.paraview.org/t/plot-data/8486
**Category:** ParaView Support
**Created:** [November 24, 2021, 9:35pm UTC](https://discourse.paraview.org/t/plot-data/8486 "2021-11-24T21:35:54Z")
**Posts on this page:** 5
**Page:** 1

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### Author: ![Pradip\_Aryal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/pradip_aryal/32/8071_2.png) [@Pradip\_Aryal](https://discourse.paraview.org/u/Pradip_Aryal)
#### Post date: [November 24, 2021, 9:35pm UTC](https://discourse.paraview.org/t/plot-data/8486/1 "2021-11-24T21:35:54Z")

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Hi Mathieau,

I have this kind of iso-surface (alpha = 0.5). Now I would like to plot Max(U(mag)) on that surface over time. Is it something we can do with Python ProgrammableFilter. Could you please give some hint.  
(Solver: interfoam)

Best regards,  
James

 ![11](https://discourse.paraview.org/uploads/default/original/2X/0/0638c4ed01b8d7a988d3fb4271968e5a642b12bd.jpeg)

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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: [November 25, 2021, 9:02am UTC](https://discourse.paraview.org/t/plot-data/8486/2 "2021-11-25T09:02:31Z")

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please share your data

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### Author: ![Pradip\_Aryal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/pradip_aryal/32/8071_2.png) [@Pradip\_Aryal](https://discourse.paraview.org/u/Pradip_Aryal)
#### Post date: [November 29, 2021, 4:30pm UTC](https://discourse.paraview.org/t/plot-data/8486/3 "2021-11-29T16:30:55Z")

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Hi Mathieu,

I uploaded my data to the link below. I uploaded only about 6 time-steps to reduce the size of the file but in my original file, I have about 700 time steps.

So ideally, what I was looking forward to doing was to obtain the maximum velocity magnitude for each time-step at the isosurface of alpha.phase1 = 0.5.

Currently, I take a contour of alpha.phase1 with value 0.5 and visualize the velocity and see that maximum velocity. This is a very lengthy process and not possible to do for 700 time steps for several cases.

I would appreciate if there is a way around extracting it with ProgrammableFilter.

[https://drive.google.com/drive/folders/1x\_Qv-6KtDWudiv5XFy3\_nQhvDVYmjsef?usp=sharing](https://drive.google.com/drive/folders/1x_Qv-6KtDWudiv5XFy3_nQhvDVYmjsef?usp=sharing)

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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: [November 30, 2021, 10:25am UTC](https://discourse.paraview.org/t/plot-data/8486/4 "2021-11-30T10:25:04Z")

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A PythonCalculator and a PlotDataOverTime is enough.

Use the following in your PythonCalculator:

`max(mag(U))`

 ![image](https://discourse.paraview.org/uploads/default/original/2X/4/41ec494c5a673c84b0ad6a1ec22b162a96a4a039.png)

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### Author: ![Pradip\_Aryal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/pradip_aryal/32/8071_2.png) [@Pradip\_Aryal](https://discourse.paraview.org/u/Pradip_Aryal)
#### Post date: [December 2, 2021, 3:47pm UTC](https://discourse.paraview.org/t/plot-data/8486/5 "2021-12-02T15:47:50Z")

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Thank you, Mathieu. It does exactly what I want.

Best regards,