[Octave-bug-tracker] [bug #53351] A = expint(x>32+yi) doesn't result any imaginary number

[Mina Mourice]

URL:
  <http://savannah.gnu.org/bugs/?53351>

                 Summary: A = expint(x>32+yi) doesn't result any imaginary
number
                 Project: GNU Octave
            Submitted by: mourice
            Submitted on: Thu 15 Mar 2018 12:47:18 PM UTC
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.1
        Operating System: Any

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Details:

In Exponential integral :
For complex values , the argument of the complex must be less than pi
This condition is satisfied in the condition of real number(x) > 33 and
imaginary (y) = any number in a suitable range


Using MATLAB :

>> A = expint(32.5+1i)
A =

   1.1811e-16 - 1.9663e-16i

>> B = expint(44+1i)
B =

   9.0188e-22 - 1.4758e-21i

Using Octave GNU Release 4.2.1 :

>> A = expint(32.5+1i)
܀A =   1.1811e-016

>> B = expint(44+1i)
y㌒ऀB =   9.0188e-022





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