# How to get selection for plot s. over Time of descriptive Statistics Filter?
**URL:** https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473
**Category:** ParaView Support
**Created:** [August 26, 2019, 6:42am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473 "2019-08-26T06:42:19Z")
**Posts on this page:** 12
**Page:** 1
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 6:42am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/1 "2019-08-26T06:42:19Z")
Hey there,
I fail at making a working selection via script.
How can I determine what to write at Selection=
[…]
plotSelectionOverTime1 = PlotSelectionOverTime(Input=descriptiveStatistics1,
Selection=None)
[…]
Error msg is this: Warning: In /home/ubuntu/OpenFOAM/ThirdParty-dev/ParaView-5.6.0/ParaViewCore/VTKExtensions/Default/vtkSciVizStatistics.cxx, line 581
vtkPSciVizDescriptiveStats (0x55e5205a2ed0): Every requested array wasn’t a scalar or wasn’t present.
The code I got via the Trace function.
Regards,
Terry
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 26, 2019, 6:52am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/2 "2019-08-26T06:52:05Z")
Tracing does not work with selection (yet). You have to create the selection manually in your script first.
Use something like :
```
selection = SelectCells("id <= 35")
plotSelectionOverTime1 = PlotSelectionOverTime(Input=descriptiveStatistics1,
Selection=selection)
```
---
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 6:53am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/3 "2019-08-26T06:53:20Z")
Thank you for your very fast reply!
How can I determine an ID for a filter output that does not show in RenderView?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 26, 2019, 6:54am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/4 "2019-08-26T06:54:05Z")
the “id \<= 35” is just a dummy formula. How do you select your cells or points usually ?
---
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 6:57am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/5 "2019-08-26T06:57:45Z")
Usually I use something like:
for i in range(2):
selection = SelectCells(query=“id==” +str(i))
plotSelectionOverTime = PlotSelectionOverTime(Input=contour1, Selection=selection)
However I can’t find a way to determine to select something after using the descriptiveStatistics filter via paraviev.simple as it does not “create a cell to select” like many other filters do.
---
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 7:19am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/6 "2019-08-26T07:19:43Z")
Maybe I have to go the other way around:
Instead of: select --\> plot selection over time
I could try: SaveData with proxy descriptiveStatistics and WriteTimeSteps=1. And write me something to get the data out of all these files and into one I could use with gnuplot…
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 26, 2019, 7:27am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/7 "2019-08-26T07:27:18Z")
Right, you want to select rows in a table, i missed that.
There is no SelectRows (yet), but you can do it manually with the following code:
```
selSource = servermanager.sources.SelectionQuerySource()
selSource.FieldType = "ROW"
selSource.QueryString = "id == 2"
descriptiveStatistics.SMProxy.SetSelectionInput(descriptiveStatistics.Port, selSource.SMProxy, 0)
```
be aware that the Spreadsheet view does not update itself with these manual selections, so you will have to create a new one to see it.
---
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 7:28am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/8 "2019-08-26T07:28:03Z")
Thank you so much, I will try that right now. 🙂
---
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 8:00am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/9 "2019-08-26T08:00:03Z")
If I’m correct the selection is working now with your code.
However I am still not able to use the filter via python
This is the TraceBack:
create a new ‘OpenFOAMReader’
create a new ‘Descriptive Statistics’
Traceback (most recent call last):
File “volumenschwerpunkt.py”, line 39, in
descriptiveStatistics1.AttributeMode = ‘Point Data’
File “/opt/paraviewopenfoam56/lib/python2.7/site-packages/paraview/servermanager.py”, line 471, in **setattr**
raise ValueError("%s is not a valid value for attribute s." (value, name))
ValueError: Point Data is not a valid value for attribute AttributeMode.
‘Field Data’ is accepted instead of ‘Point Data’ but empty.
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 26, 2019, 8:03am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/10 "2019-08-26T08:03:13Z")
Works fine here, could you send a minimal example reproducing the error ?
---
### Author:  [@Terry](https://discourse.paraview.org/u/Terry)
#### Post date: [August 26, 2019, 9:08am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/11 "2019-08-26T09:08:38Z")
While making the minimal example I had an Idea and it works now:
Before from the trace:
descriptiveStatistics2 = DescriptiveStatistics(Input=calculator2,
ModelInput=None)
descriptiveStatistics2.AttributeMode = ‘Point Data’
descriptiveStatistics2.VariablesofInterest = [‘U’, ‘alpha.water’, ‘p\_rgh’, ‘postion’]
descriptiveStatistics2.Task = 0
descriptiveStatistics2.TrainingFraction = 0.1
descriptiveStatistics2.Deviationsshouldbe = 0
Now Working:
print “create a new ‘Descriptive Statistics’”
descriptiveStatistics1 = DescriptiveStatistics(Input=calculator1, ModelInput=None)
descriptiveStatistics1.AttributeMode = 0
descriptiveStatistics1.VariablesofInterest = [‘U’, ‘alpha.water’, ‘p\_rgh’, ‘position’]
descriptiveStatistics1.Task = 0
descriptiveStatistics1.TrainingFraction = 0.1
descriptiveStatistics1.Deviationsshouldbe = 0
Thank you very much for your help!
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [August 26, 2019, 9:11am UTC](https://discourse.paraview.org/t/how-to-get-selection-for-plot-s-over-time-of-descriptive-statistics-filter/2473/12 "2019-08-26T09:11:06Z")
Great. FYI, on ParaView 5.7, enum in Python should work.