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[Octave-bug-tracker] [bug #60839] Better document that `mldivide` and `m


From: Markus Mützel
Subject: [Octave-bug-tracker] [bug #60839] Better document that `mldivide` and `mrdivide` might return minimum norm solutions
Date: Mon, 28 Jun 2021 03:00:06 -0400 (EDT)
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36 Edg/91.0.864.59

Update of bug #60839 (project octave):

                Category:         Octave Function => Documentation          
                Severity:              3 - Normal => 2 - Minor              
                Priority:              5 - Normal => 3 - Low                
              Item Group:        Incorrect Result => Documentation          
                  Status:                 Invalid => Confirmed              
             Open/Closed:                  Closed => Open                   
        Operating System:               GNU/Linux => Any                    
                 Summary: linsolve returns an incorrect solution with an
inconsistent system => Better document that `mldivide` and `mrdivide` might
return minimum norm solutions

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Follow-up Comment #3:

I was opening the documentation browser with `doc linsolve` in Octave 6.2.92
and clicked on the `mldivide` link in the "see also" section which led me to:
>> x \ y
>>   Left division. This is conceptually equivalent to the expression 
>>     inv (x) * y 
>>   but it is computed without forming the inverse of x. 
>>   If the system is not square, or if the coefficient matrix is singular, a
minimum norm solution is computed. 

But I now see the docstring you are showing further down on the same page.

We could probably repeat the last sentence above in the docstrings of
`mldivide` and `mrdivide`.

Re-opening with category "Documentation".


    _______________________________________________________

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  <https://savannah.gnu.org/bugs/?60839>

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