[Octave-bug-tracker] [bug #36121] num2str(2.4e9, 15) gives incorrect result

[Sebastian Held]

URL:
  <http://savannah.gnu.org/bugs/?36121>

                 Summary: num2str(2.4e9,15) gives incorrect result
                 Project: GNU Octave
            Submitted by: sibbi77
            Submitted on: Sat 07 Apr 2012 10:31:39 AM 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: 3.6.1
        Operating System: GNU/Linux

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Details:

the num2str() function has a flaw concerning large numbers.
If a number is smaller than 10^<given precision>, the sprintf format is '%d',
but this format is limited to intmax.

Example:

num2str(2.4e9,15)
ans = -1894967296


num2str.m should be fixed to include an additional check, if the number is
below intmax, otherwise %g or %f must be used.




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