The "first non-fill-value" in which order? (chronological, C-order, ...)
Short answer: No chance.
Slightly longer: (Apart from H5DOwrite_chunk...) There is currently no API that
gives you direct control over/introspection into chunks. You can control certain
aspects of chunk allocation time and policy (via dataset creation properties),
but the rest is pretty opaque and a side-effect of H5D[read,write].
I think you have at least two options:
1. Create an auxiliary structure where you maintain that type of log
information.
(This is dangerous/illusionary because you'll be making assumptions about
how the
HDF5 library writes/updates chunks, and what happens in the underlying
storage.)
2. Create a proper sparse structure and don't use chunking to mimic one.
(You might still struggle with the definition of 'first.')
G.
From: Hdf-forum [mailto:[email protected]] On Behalf Of Efim
Dyadkin
Sent: Wednesday, April 19, 2017 5:04 PM
To: [email protected]
Subject: [Hdf-forum] first non-fill-value in the sparse chunked dataset
Hi,
I am using a sparse chunked dataset with a certain fill value. I'd like to find
a first non-fill-value element in the dataset. Can I narrow down my search to a
first available chunk? How can I do it?
Thank you,
Efim Dyadkin
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