bugGNU Octave - Bugs: bug #35621, invert function bin2dec of dec2bin

 
 

bug #35621: invert function bin2dec of dec2bin

Submitter:  None
Submitted:  Fri 24 Feb 2012 05:01:50 PM UTC
   
 
Category:  Libraries Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Fixed Assigned to:  None
Originator Name:  bin2dec Originator Email:  -email is unavailable-
Open/Closed:  * Closed Release:  * 3.4.3
Operating System:  * GNU/Linux Fixed Release:  None
Planned Release:  None
* Mandatory Fields

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Fri 24 Feb 2012 11:04:12 PM UTC, comment #1: 

Fixed in this changeset (http://hg.savannah.gnu.org/hgweb/octave/rev/731e9e1539a8) on the stable branch.  The correct behavior will be available at the next patch release 3.6.2.  Alternatively, you can build from the stable Mercurial branch to access the fix immediately.

 Rik <rik5>
Group administrator
Fri 24 Feb 2012 05:01:50 PM UTC, original submission:  

bin2dec seem to be the invert function dec2bin.
So, we expect this kind of result:

bin2dec( dec2bin( X )) == X

BUT It don't occur for X valued with 0 and 1 !


Example 1:

octave:1> bin2dec(dec2bin(0:4))'
ans =

   0   1   2   3   4

octave:2> bin2dec(dec2bin(0:3))'
ans =

   0   1   2   3

octave:3> bin2dec(dec2bin(0:2))'
ans =

   0   1   2

octave:4> bin2dec(dec2bin(0:1))'
ans =  1

octave:5> bin2dec(dec2bin(0:0))'
ans = 0



Example 2:

octave:30> bin2dec(dec2bin([1 0 3]))
ans =

   1
   0
   3

octave:31> bin2dec(dec2bin([1 0 3])')
ans =

   1
   5

That's OK, but:

octave:34> bin2dec(dec2bin([1 0 0 1 0 1 0]))
ans =  74

octave:35> bin2dec(dec2bin([1 0 0 1 0 1 0])')
ans =  74

Should not have this behavior.

 Anonymous

 

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  • -email is unavailable- added by rik5 (Posted a comment)

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    Follow 2 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2012-02-24 rik5 StatusNone Fixed
        Open/ClosedOpen Closed

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