# \#numpy\_interface

**URL:** https://discourse.vtk.org/tag/numpy-interface/38.md

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## [Mismatch of points/tuples between vtkmCleanGrid and its VTK-numpy-wrapper](https://discourse.vtk.org/t/mismatch-of-points-tuples-between-vtkmcleangrid-and-its-vtk-numpy-wrapper/16517)

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**Author:** [@Bodacious](https://discourse.vtk.org/u/Bodacious)\
**Replies:** 1\
**Last updated:** [August 25, 2026, 4:13pm UTC](https://discourse.vtk.org/t/mismatch-of-points-tuples-between-vtkmcleangrid-and-its-vtk-numpy-wrapper/16517 "2026-08-25T16:13:14Z")

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Hello, This post is a repost of https://discourse.paraview.org/t/mismatch-of-points-tuples-between-vtkmcleangrid-and-its-vtk-numpy-wrapper/17698?u=bodacious after @mwestphal proposition. I have a vtkUnstructuredGrid dat…

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## [Possible bug in in numpy\_interface.algorithms.matmul?](https://discourse.vtk.org/t/possible-bug-in-in-numpy-interface-algorithms-matmul/15744)

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**Author:** [@scotsman60](https://discourse.vtk.org/u/scotsman60)\
**Replies:** 1\
**Last updated:** [June 18, 2025, 10:59pm UTC](https://discourse.vtk.org/t/possible-bug-in-in-numpy-interface-algorithms-matmul/15744 "2025-06-18T22:59:19Z")

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Hello!!! I’m using VTK 9.4 with Python 3.12 I’m trying to use the numpy\_interface.algorithms.matmul method on a vtkCompositeDataArray and finding that it’s not doing what I expect. IMO, there’s either an error in matm…