# Numpy-style programmable filter breaks on multiblock data

**URL:** https://discourse.paraview.org/t/numpy-style-programmable-filter-breaks-on-multiblock-data/4612
**Category:** ParaView Support
**Created:** [June 17, 2020, 9:46pm UTC](https://discourse.paraview.org/t/numpy-style-programmable-filter-breaks-on-multiblock-data/4612 "2020-06-17T21:46:47Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![woodscn](https://discourse.paraview.org/user_avatar/discourse.paraview.org/woodscn/32/3226_2.png) [@woodscn](https://discourse.paraview.org/u/woodscn)
#### Post date: [June 17, 2020, 9:46pm UTC](https://discourse.paraview.org/t/numpy-style-programmable-filter-breaks-on-multiblock-data/4612/1 "2020-06-17T21:46:48Z")

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I’ve attached a stand-alone state file showing surprising behavior when trying a programmable filter on multiblock data. Is there some reason why what I’m trying to do here shouldn’t work?

Thanks,

Nathan  
[BreakingNumpywithMultiblockData.pvsm](https://discourse.paraview.org/uploads/short-url/n0JKPELYm2WruM5nn8HHJhMQjkB.pvsm) (388.9 KB)