[Octave-bug-tracker] [bug #41346] spconvert() with complex matrices

[Carlo de Falco]

Follow-up Comment #1, bug #41346 (project octave):

Hi,

Thanks for posting this report.
As I noted in my reply on the mailing list,
this issue is due to an error on the part of 
PETSc which exploits an undocumented feature in 
Matlab's 'spconvert' so you should also report
it to the PETSc developers:

http://www.mcs.anl.gov/petsc/documentation/bugreporting.html

The fix would be trivial there to, simply
export complex sparse matrices as real matrices
with four columns instead of complex matrices with
three columns, i.e.:


s = [irow jcol xreal yimag]
mat = spconvert (s)


instead of 


s = [irow jcol xreal + i yimag)]
mat = spconvert (s)


Anyway I'll wait for comments 
from the core developers
to see if we should follow the undocumented
Matlab behaviour in Octave.

c. 

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