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[Octave-bug-tracker] [bug #53425] factor.m: Octave producing neither err
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From: |
Rik |
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Subject: |
[Octave-bug-tracker] [bug #53425] factor.m: Octave producing neither error nor correct result |
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Date: |
Fri, 23 Mar 2018 12:20:06 -0400 (EDT) |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0 |
Follow-up Comment #3, bug #53425 (project octave):
Again, Octave tries to be a superset of Matlab. We could simply emit an
error, as Matlab does. Alternatively, for negative integers (-N) we could
produce factor (N) and then reverse the sign of the first factor. Sample
code:
neg_q = false;
if (q < 0)
neg_q = true;
q = -q;
endif
...
normal algorithm
...
if (neg_q)
pf(1) = -pf(1);
endif
I'm not a number theory person so I don't know which option is preferred. You
could ask on the Octave-Maintainers list and maybe that is someone's area of
expertise.
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