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

 Submitter: None Submitted: 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 Fixed Release: None Planned Release: None
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## Discussion

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>
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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