# Help with calculator

**URL:** https://discourse.paraview.org/t/help-with-calculator/13646
**Category:** ParaView Support
**Created:** [January 6, 2024, 8:37am UTC](https://discourse.paraview.org/t/help-with-calculator/13646 "2024-01-06T08:37:53Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![SKSoni](https://discourse.paraview.org/user_avatar/discourse.paraview.org/sksoni/32/11700_2.png) [@SKSoni](https://discourse.paraview.org/u/SKSoni)
#### Post date: [January 6, 2024, 8:37am UTC](https://discourse.paraview.org/t/help-with-calculator/13646/1 "2024-01-06T08:37:53Z")

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Hello @Kenneth_Moreland

In my case, i am using 3D CSV Data which has following columns [x, y, z, u1, u2, u3, T]

and I have followed the steps as you described but unfortunately an error message is coming up  
"undefined u1 " while computing stream function.

could you please suggest to get rid of this issue?

My CSV file is  
[data.csv](https://discourse.paraview.org/uploads/short-url/iyGKn1lDY49w3P1uhbHuOTUiR46.csv) (332.6 KB)