# Subtract scalar on different slices
**URL:** https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971
**Category:** ParaView Support
**Created:** [December 14, 2022, 10:48am UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971 "2022-12-14T10:48:15Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@rcarneiro](https://discourse.paraview.org/u/rcarneiro)
#### Post date: [December 14, 2022, 10:48am UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/1 "2022-12-14T10:48:15Z")
Hello everyone,
I would like to know if, in Paraview, is possible to subtract the temperature of 2 slices that are at different heights in the same computational domain?
The result would be a matrix with the result of the subtraction …
In the attached file you can see an example.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 14, 2022, 12:07pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/2 "2022-12-14T12:07:43Z")
Hi @rcarneiro
If you input is a structured grid, then your two slices should contains the same number of points and cells.
Then computing anything between the two slides would be trivial using PythonCalculator filter.
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### Author:  [@rcarneiro](https://discourse.paraview.org/u/rcarneiro)
#### Post date: [December 14, 2022, 12:20pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/3 "2022-12-14T12:20:05Z")
Something like this? My question now is, how do I refer to the temperature of the slice 1 and slice 2 in the python calculator? Note that the data array name is the same (TEMPERATURE).
Thank you.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 14, 2022, 12:31pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/4 "2022-12-14T12:31:27Z")
`inputs[0].PointData["TEMPERATURE"] - inputs[1].PointData["TEMPERATURE"]`
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### Author:  [@Andy\_Bauer](https://discourse.paraview.org/u/Andy_Bauer)
#### Post date: [December 14, 2022, 2:19pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/5 "2022-12-14T14:19:54Z")
Are quotes needed around `TEMPERATURE` ?
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [December 14, 2022, 2:48pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/6 "2022-12-14T14:48:51Z")
edited
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### Author:  [@rcarneiro](https://discourse.paraview.org/u/rcarneiro)
#### Post date: [December 14, 2022, 2:48pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/7 "2022-12-14T14:48:53Z")
Yes,quotes are needed.
And if you are working with cell data use: CellData[“TEMPERATURE”]
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 23, 2023, 12:11pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/8 "2023-10-23T12:11:05Z")
A post was split to a new topic: [Using python calculator](https://discourse.paraview.org/t/using-python-calculator/13082)
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### Author:  [@scabo](https://discourse.paraview.org/u/scabo)
#### Post date: [August 3, 2024, 2:42pm UTC](https://discourse.paraview.org/t/subtract-scalar-on-different-slices/10971/9 "2024-08-03T14:42:04Z")
how does this line imply that they are only refering to the slices and not any other geometry in the pipeline? What is i have more slices in the pipeline and i want to refer to 2 specific slices or surface vectors on the slices?