[Octave-bug-tracker] [bug #51556] function isreal applied on complex numbers with zero imaginary part

[Ernst Reissner]

URL:
  <http://savannah.gnu.org/bugs/?51556>

                 Summary: function isreal applied on complex numbers with zero
imaginary part 
                 Project: GNU Octave
            Submitted by: ernstreissner
            Submitted on: Mon 24 Jul 2017 12:02:48 PM UTC
                Category: Octave Function
                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: Any

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Details:

According to 
https://www.mathworks.com/help/matlab/ref/isreal.html

isreal(x) determines whether a has real *type*. 
Consequently, isreal(0i) is false in matlab. 
also isreal([0i 1]) is just false, a single scalar value 
because the type is meant, not zero imaginary part in all components. 

The current usage of isreal(A) 
which means imag(A) is nonzero may be substituted by 

~any(imag(A)). 




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