[bug #68300] blkdiag with arguments of type single returns result of type double

"Dmitri A. Sergatskov" <[email protected]> Mon, 4 May 2026 09:09:04 -0400 (EDT)

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

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Follow-up Comment #11, bug #68300 (group octave):

`isa()` probably wins with large arrays, but may be it is a wrong use case to
optimize too.


octave:30> a = ones(5000, "uint8");
octave:31> b = double(a);
octave:32> tic; for jj=1:100 ; x = isa(b,"double"); endfor; toc
Elapsed time is 0.000447035 seconds.
octave:33> tic; for jj=1:100 ; x = isa(a,"double"); endfor; toc
Elapsed time is 0.00031209 seconds.
octave:34> tic; for jj=1:100 ; b = double(a); endfor; toc
Elapsed time is 2.73394 seconds.


Dmitri.
-- 



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