bugGNU Octave - Bugs: bug #57671, Power operator operating on...

 
 

bug #57671: Power operator operating on complex numbers results in NaN when broadcasting

Submitted by:  None
Submitted on:  Sun 26 Jan 2020 11:18:40 PM UTC  
 
Category:  Interpreter Severity:  4 - Important
Priority:  5 - Normal Item Group:  Incorrect Result
Status:  Confirmed Assigned to:  None
Originator Name:  gs Originator Email:  -email is unavailable-
Open/Closed:  Open Release:  dev
Operating System:  GNU/Linux

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Mon 27 Jan 2020 01:35:49 AM UTC, comment #2: 

Bumping the version up to "dev" since this is still present.  The issue seems to be related to broadcasting and I have changed the Summary to reflect that.

A simple test case with broadcasting that fails is

([1;0]*j) .^ [1, 0]
ans =

   0.0000 + 1.0000i   1.0000 +      0i
        0 +      0i      NaN -    NaNi

But if the matrices are full and there is no broadcasting then this works

([1,1; 0,0]*j) .^ [1, 0; 1, 0]
ans =

   0 + 1i   1 + 0i
   0 + 0i   1 + 0i

Rik <rik5>
Project Administrator
Mon 27 Jan 2020 12:08:09 AM UTC, comment #1: 

I tried on 5.2.0

> (j*[0;0]).^[2 1 0]

ans =

   0   0   1
   0   0   1

>> (j*[0;0;0]).^[2 1 0]

ans =

   0   0   1
   0   0   1
   0   0   1

>> (j*[0;1;0]).^[2 1 0]

ans =

   0.00000 + 0.00000i   0.00000 + 0.00000i       NaN -     NaNi
  -1.00000 + 0.00000i   0.00000 + 1.00000i   1.00000 + 0.00000i
   0.00000 + 0.00000i   0.00000 + 0.00000i       NaN -     NaNi

>>

Doug Stewart <dastew>
Sun 26 Jan 2020 11:18:40 PM UTC, original submission:  

j is the complex operator

note the NaN in the last one

>> (j*[0]).^[2 1 0]


ans =

   0   0   1

>> (j*[1]).^[2 1 0]


ans =

  -1 + 0i   0 + 1i   1 + 0i

>> (j*[0;1]).^[2 1 0]


ans =

   0.00000 + 0.00000i   0.00000 + 0.00000i       NaN -     NaNi
  -1.00000 + 0.00000i   0.00000 + 1.00000i   1.00000 + 0.00000i

Anonymous

 

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    Follow 6 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2020-01-27 rik5 CategoryNone => Interpreter
        Severity3 - Normal => 4 - Important
        Item GroupNone => Incorrect Result
        StatusNone => Confirmed
        Release4.2.2 => dev
        SummaryComplex numbers in array gives NaN => Power operator operating on complex numbers results in NaN when broadcasting

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