[Octave-bug-tracker] [bug #29721] tests for function svds frequently fails

[Rik]

Follow-up Comment #6, bug #29721 (project octave):

It seems that there could be possible competition at link time between your
installed ARPACK and the one shipped with Octave.

I would remove the packages libarpack++2-dev libarpack++2c2a libarpack2
libarpack2-dev.  Then I would do a full reset and recompile.


make distclean
hg branch default
hg update tip
sh autogen.sh
./configure  --any_options_you_have--
make
make test


It's still very odd that this is failing.  ARPACK is an iterative solver and
the results depend on the initial position from where it starts the search. 
This is the reason for initializing the random number generator and always
using the same starting point.  That is the change I made that allowed this
bug report to be closed the first time.  We could move to a different initial
seed (41 or 43 instead of 42), but this would mean verifying that the new seed
doesn't create problems on other systems.  In fact, if the complete rebuild
fails I might suggest that we compare the value of the initial vector used on
your system and on mine to see if they differ.

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