# Integrate variables over points
**URL:** https://discourse.paraview.org/t/integrate-variables-over-points/3227
**Category:** ParaView Support
**Created:** [December 23, 2019, 3:36pm UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227 "2019-12-23T15:36:37Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@vishruthdilip](https://discourse.paraview.org/u/vishruthdilip)
#### Post date: [December 23, 2019, 3:36pm UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227/1 "2019-12-23T15:36:38Z")
Hello,
Is it possible to integrate variables by selecting points, instead of selecting a surface?
I have created an Extract Selection by selecting the points I want manually. I want to apply a Calculator filter to this Extract selection and then integrate it.
Is this possible? or does paraview only integrate over surfaces i.e Extract surface, slice, clip etc…?
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### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [December 23, 2019, 4:37pm UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227/2 "2019-12-23T16:37:52Z")
**Integrate Variables** sums point data arrays, so yes, you can integrate points you select and extract.
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### Author:  [@vishruthdilip](https://discourse.paraview.org/u/vishruthdilip)
#### Post date: [December 24, 2019, 10:20am UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227/3 "2019-12-24T10:20:23Z")
but when i applied the integrate variables filter to the calculator filter, i get results for all variables as 0. and i can see in the statistics inspector no points are selected.
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### Author:  [@cory.quammen](https://discourse.paraview.org/u/cory.quammen)
#### Post date: [January 7, 2020, 5:57pm UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227/4 "2020-01-07T17:57:19Z")
Does the output of the **Extract Selection** filter have any points in the output? Click on that filter in the _Pipeline Browser_ and see what it says in the _Information_ tab. If Number of Points is 0, you haven’t extracted anything.
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### Author:  [@vishruthdilip](https://discourse.paraview.org/u/vishruthdilip)
#### Post date: [January 22, 2020, 12:40pm UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227/5 "2020-01-22T12:40:09Z")
Yes, in the statistics inspector browser i can see the number of points for both the Extract Selection filter and Calculator filter is 70 and the data type is Multiblock dataset.
When i apply the Integrate Variables filter, the number of points is one and the data type is Unstrutured Grid.
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### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [October 4, 2024, 7:32am UTC](https://discourse.paraview.org/t/integrate-variables-over-points/3227/6 "2024-10-04T07:32:19Z")
A post was split to a new topic: [Integrate multiblock](https://discourse.paraview.org/t/integrate-multiblock/15492)