Dear all,

Could you tell me please how do I get a data view of a zarr array? The key thing is performance.

From the docs, it looks like there is two options:

• Usegetitem via ":" notation
  (store is existing DirectoryStore, there is one group 'sgroup' and one 3D array 'sarr')

root = zarr.group(store=store)arr = root.sgroup.sarrslice = arr[1:3, 1:3, 1:3]

• Useget_basic_selection

root = zarr.group(store=store)arr = root.sgroup.sarrslice = arr.get_basic_selection(slice(1, 3), slice(1,3), slice(1,3))

In general, what is the difference between them? Would both options indeed get slice without loading entire array? Are there better alternatives in terms of performance?

Best regards,
Aliaksei

• Value ofzarr.__version__: 2.10.3
• Value ofnumcodecs.__version__: 0.9.1
• Version of Python interpreter: 3.8.2
• Operating system (Linux/Windows/Mac): Windows 7
• How Zarr was installed (e.g., "using pip into virtual environment", or "using conda"): using pip into virtual environment