[Octave-bug-tracker] [bug #45890] Sparse A*x and A+B are a bit slow

[Ceral Paquet]

Follow-up Comment #2, bug #45890 (project octave):

Hi Kai,

I compiled Octave using ./configure on 64-bit Xubuntu (sadly, I still can't
get --enable-64 to work). I left out all non-essential components such as
SuiteSparse, so presumably octave is using this code?

~/octave-4.0.0/liboctave/array/Sparse*
~/octave-4.0.0/liboctave/array/MSparse* 

I scanned them but can't really figure out what's going on. Are there 2
separate implementations of sparse array? E.g. where is A*x implemented? If
you could start me off, I'd be happy to delve into it more - thanks.

(By the way I think you read the benchmarks wrong - Octave is much faster then
Matlab at sparse creation but twice as slow at A+B and 50% slower at A*x.)


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