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[Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab
From: |
Rik |
Subject: |
[Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab |
Date: |
Fri, 16 Jun 2017 11:50:24 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0 |
Update of bug #51246 (project octave):
Status: None => In Progress
Summary: pinv(0) => pinv(0) different from
Matlab
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Follow-up Comment #2:
Leaving aside what Matlab does for the moment, what would you like to see for
the inverse of a scalar?
In general, the inverse would just be 1/x for a scalar. So,
pinv (5)
ans = 0.20000
If I follow this analogy, pinv(0) should return 1/0
octave:2> 1/0
warning: division by zero
ans = Inf
which is what the function seems to be doing.
Of course, maybe it is better to be Matlab compatible for this case. Or maybe
pinv should follow inv.
octave:5> inv (0)
warning: matrix singular to machine precision
ans = 0
There is definitely room for interpretation here, rather than being absolutely
the wrong answer. Maybe you should post on the Octave Maintainer's list to
gather some other opinions.
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?51246>
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- [Octave-bug-tracker] [bug #51246] pinv(0), Guillaume, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0), Marco Caliari, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab,
Rik <=
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Guillaume, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Rik, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Rik, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Marco Caliari, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Rik, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Rik, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Rik, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Rik, 2017/06/16
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Marco Caliari, 2017/06/17
- [Octave-bug-tracker] [bug #51246] pinv(0) different from Matlab, Guillaume, 2017/06/20