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[Octave-bug-tracker] [bug #41612] pinv with tol fix for Diagonal Matrice

From: anonymous
Subject: [Octave-bug-tracker] [bug #41612] pinv with tol fix for Diagonal Matrices
Date: Sun, 16 Feb 2014 19:55:30 +0000
User-agent: Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:27.0) Gecko/20100101 Firefox/27.0


                 Summary: pinv with tol fix for Diagonal Matrices
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Sun 16 Feb 2014 07:55:29 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any



I just noticed a patch got sent to fix a bug I reported last week.

Awesome - thanks. However there's a small gotcha in the new code:

+      if (std::abs (elem (i, i)) < tol)
+        retval.elem (i, i) = 0.0;
+      else
         retval.elem (i, i) = 1.0 / elem (i, i);

When tol==0 and elem(i,i)==0, the code will divide by zero. Otherwise looks
good - sorry I couldn't find the original bug report so I had to re-post.


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