[bug #68251] Load-Save support for MAT-file v7.3 (HDF5-based format)

Rik <[email protected]> Wed, 22 Apr 2026 16:16:17 -0400 (EDT)

Newsgroups	gmane.comp.gnu.octave.bugs
Message-ID	<[email protected]>

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Follow-up Comment #4, bug #68251 (group octave):

We should absolutely clean up Octave's implementation of HDF5 to use modern
API.  There is even an ancient bug report about this from 2013!  See bug
#39491.

Your fix for bug #68237 got me to look at the load/save implementation in
Octave.  For one thing, I found that saving in some formats such as Octave's
very own *-text* format takes a really long time.  See the thread I opened on
Discourse at
https://octave.discourse.group/t/performance-improvements-for-save-in-octaves-native-text-format/7504.

Native HDF5 in Octave is quick, and also can represent arrays with more than
2^31 elements which Octave's own binary format cannot.

One of the problems I encountered with saving long files is that it could take
up to 10 minutes and Ctrl+C was not working.  See this new changeset
(https://hg.savannah.gnu.org/hgweb/octave/rev/1fab643922fb) where I added
*octave_quit()* calls in strategic places to make it possible to interrupt the
load/save operation.



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