[Octave-bug-tracker] [bug #33104] mat2str returns ugly result (different to Matlab)

[Patrick Häcker]

URL:
  <http://savannah.gnu.org/bugs/?33104>

                 Summary: mat2str returns ugly result (different to Matlab)
                 Project: GNU Octave
            Submitted by: magicmuscleman
            Submitted on: So 17 Apr 2011 10:55:27 GMT
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: GNU/Linux

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Details:

Matlab:
mat2str(0.7)
ans = 0.7

Octave:
mat2str(0.7)
ans = 0.69999999999999996

This behaviour is related with internal floating point representation, and the
used precision:

Octave:
mat2str(0.5)
ans = 0.5

According to Matlab's documentation
(http://www.mathworks.com/help/techdoc/ref/mat2str.html), the precision's
default is 15 digits.

The attached patch sets the default accordingly and adds a test case to show
the problem in the unpatched version and its solution in the patched version.



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File Attachments:


-------------------------------------------------------
Date: So 17 Apr 2011 10:55:27 GMT  Name: patch  Size: 272B   By:
magicmuscleman

<http://savannah.gnu.org/bugs/download.php?file_id=23263>

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