# Merging a 3D array on the second axis

**URL:** <https://forum.hdfgroup.org/t/merging-a-3d-array-on-the-second-axis/13306>\
**Category:** h5py\
**Created:** [June 3, 2025, 12:28pm UTC](https://forum.hdfgroup.org/t/merging-a-3d-array-on-the-second-axis/13306 "2025-06-03T12:28:19Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![ajelenak](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/a/3d9bf3/32.png) [@ajelenak](https://forum.hdfgroup.org/u/ajelenak)\
**Post date:** [June 3, 2025, 3:22pm UTC](https://forum.hdfgroup.org/t/merging-a-3d-array-on-the-second-axis/13306/2 "2025-06-03T15:22:15Z")

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One option is to use [Virtual Datasets](https://docs.h5py.org/en/latest/vds.html) and avoid creating one huge HDF5 file.

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_[View the full topic](https://forum.hdfgroup.org/t/merging-a-3d-array-on-the-second-axis/13306)._