# How to change the index of the first point for plotting
**URL:** https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122
**Category:** ParaView Support
**Created:** [February 7, 2025, 12:02am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122 "2025-02-07T00:02:04Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@s1291](https://discourse.paraview.org/u/s1291)
#### Post date: [February 7, 2025, 12:02am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122/1 "2025-02-07T00:02:04Z")
Hello,
I have the following set of vertex cells as shown in the screenshot below:
These vertex cells are ordered **counter-clockwise** as indicated (notice the cells with index 0, 1, … 13, … etc).
When I use the “ **Plot Data** ” Filter and checking the option “Use Index for X Axis” (as shown below):
I want to shift the index of the points: So for example: I want the point with index 13 (shown in the first screenshot above) to be the point with index 0, Index 14 to be index 1, and so on. As a result, the plot will be shifted horizontally.
How to achieve that in ParaView?
I appreciate your help.
Thank you
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 7, 2025, 8:48am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122/2 "2025-02-07T08:48:56Z")
you need to compute this shifted index. I think the simplest way would probably be by using a programmable filter to compute it.
---
### Author:  [@s1291](https://discourse.paraview.org/u/s1291)
#### Post date: [February 7, 2025, 10:02am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122/3 "2025-02-07T10:02:38Z")
How?
---
### Author:  [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [February 7, 2025, 10:03am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122/4 "2025-02-07T10:03:42Z")
[https://docs.paraview.org/en/latest/ReferenceManual/pythonProgrammableFilter.html](https://docs.paraview.org/en/latest/ReferenceManual/pythonProgrammableFilter.html)
---
### Author:  [@s1291](https://discourse.paraview.org/u/s1291)
#### Post date: [February 7, 2025, 10:15am UTC](https://discourse.paraview.org/t/how-to-change-the-index-of-the-first-point-for-plotting/16122/5 "2025-02-07T10:15:41Z")
I tried with this:
```auto
data = inputs[0]
# Get the number of points in the dataset
numPoints = data.GetNumberOfPoints()
# Create a new vtkPoints container for the rotated order
newPoints = vtk.vtkPoints()
newPoints.SetNumberOfPoints(numPoints)
offset = 13
for i in range(numPoints):
# Compute the original index for the new index i
originalIndex = (i + offset) % numPoints
pt = data.GetPoint(originalIndex)
newPoints.SetPoint(i, pt)
# Copy the input to the output so that other data (like cell data) is preserved
output.ShallowCopy(data)
# Replace the points in the output with the newly ordered points
output.SetPoints(newPoints)
```
But I get this error:
```auto
Traceback (most recent call last):
File "", line 22, in
File "", line 15, in RequestData
File "C:\Program Files\ParaView 5.13.2\bin\Lib\site-packages\vtkmodules\numpy_interface\dataset_adapter.py", line 128, in __getattr__
return getattr(self.VTKObject, name)
AttributeError: 'vtkmodules.vtkCommonDataModel.vtkMultiBlockDataSet' object has no attribute 'GetPoint'
```