# Laplacian of vector
**URL:** https://discourse.paraview.org/t/laplacian-of-vector/9144
**Category:** ParaView Support
**Tags:** python
**Created:** [March 8, 2022, 5:43pm UTC](https://discourse.paraview.org/t/laplacian-of-vector/9144 "2022-03-08T17:43:09Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Darshan](https://discourse.paraview.org/u/Darshan)
#### Post date: [March 8, 2022, 5:43pm UTC](https://discourse.paraview.org/t/laplacian-of-vector/9144/1 "2022-03-08T17:43:09Z")
Hello everyone,
I am struggling to calculate the Laplacian of vorticity vector with python calculator filter. However, I didn’t face any problem in calculating the divergence of 2D vectors and gradient of 2D vector and scalar. But I get error in calculating the laplacian since it only can be calculated to 3D vector. Any tips for calculating the laplacian of 2D vector.
[vortiicty\_terms.pvsm](https://discourse.paraview.org/uploads/short-url/jrzCIaMFcwV9TGSSTdHfDOwMkuw.pvsm) (1.7 MB)
File “C:\Program Files\ParaView 5.10.0-Windows-Python3.9-msvc2017-AMD64\bin\Lib\site-packages\vtkmodules\numpy\_interface\internal\_algorithms.py”, line 254, in divergence
raise RuntimeError(‘Divergence only works with an array of 3D vectors.’ +
RuntimeError: Divergence only works with an array of 3D vectors. Input shape (42681, 3, 3)
---
### Author:  [@Kenichiro-Yoshimi](https://discourse.paraview.org/u/Kenichiro-Yoshimi)
#### Post date: [March 12, 2022, 5:37am UTC](https://discourse.paraview.org/t/laplacian-of-vector/9144/2 "2022-03-12T05:37:54Z")
Since **laplacian** takes a scalar array as input, you need to pass an array of each component of the 2-dimensional vector:
```python
laplacian(vector_array[:, 0])
```
or
```python
laplacian(vector_array[:, 1])
```
---
### Author:  [@Darshan](https://discourse.paraview.org/u/Darshan)
#### Post date: [March 13, 2022, 3:38pm UTC](https://discourse.paraview.org/t/laplacian-of-vector/9144/3 "2022-03-13T15:38:27Z")
yes, I found the laplacian of each component and it worked. Thank you