[Octave-bug-tracker] [bug #48288] Logarithm of a quaternion with only a positive real component

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?48288>

                 Summary: Logarithm of a quaternion with only a positive real
component
                 Project: GNU Octave
            Submitted by: None
            Submitted on: Tue 21 Jun 2016 07:09:50 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: David Wang
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Microsoft Windows

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Details:

taking the logarithm of a quaternion with only a positive real component(ex.
(2, 0i, 0j, 0k)) causes the built in logarithm function of the quaternion
package to return the coefficients of the unreal components as NaN. Based on
my understanding of complex numbers, the coefficients should be set to 0 since
taking the logarithm of a complex number with 0 imaginary components is
equivalents to taking the logarithm of a real number.




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