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[Octave-bug-tracker] [bug #48315] cov.m: Incorrect result
From: |
Ryan Thompson |
Subject: |
[Octave-bug-tracker] [bug #48315] cov.m: Incorrect result |
Date: |
Sat, 25 Jun 2016 12:32:58 +0000 (UTC) |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:47.0) Gecko/20100101 Firefox/47.0 |
URL:
<http://savannah.gnu.org/bugs/?48315>
Summary: cov.m: Incorrect result
Project: GNU Octave
Submitted by: locu4096
Submitted on: Sat 25 Jun 2016 12:32:56 PM GMT
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: 4.0.2
Operating System: Any
_______________________________________________________
Details:
Hi,
I'm getting different results when calculating the covariance of a complex
matrix between Octave and MATLAB:
x = [
1.0000 - 1.0000i -1.0000 + 1.0000i 1.0000 - 1.0000i -1.0000 + 1.0000i
-1.0000 - 1.0000i 1.0000 - 1.0000i -1.0000 + 1.0000i -1.0000 + 1.0000i
1.0000 + 1.0000i 1.0000 - 1.0000i -1.0000 - 1.0000i -1.0000 + 1.0000i
-1.0000 - 1.0000i -1.0000 - 1.0000i -1.0000 + 1.0000i -1.0000 + 1.0000i]
R = cov(x')
x = [
1.0000 - 1.0000i -1.0000 + 1.0000i 1.0000 - 1.0000i -1.0000 + 1.0000i
-1.0000 - 1.0000i 1.0000 - 1.0000i -1.0000 + 1.0000i -1.0000 + 1.0000i
1.0000 + 1.0000i 1.0000 - 1.0000i -1.0000 - 1.0000i -1.0000 + 1.0000i
-1.0000 - 1.0000i -1.0000 - 1.0000i -1.0000 + 1.0000i -1.0000 + 1.0000i]
R = cov(x')
% % Octave 4.0.2
%
% R =
%
% 2.66667 - 0.00000i -0.66667 - 0.66667i 0.00000 - 0.00000i 0.00000 -
0.00000i
% -0.66667 + 0.66667i 2.33333 - 0.00000i 0.66667 + 0.66667i 1.33333 -
0.66667i
% 0.00000 + 0.00000i 0.66667 - 0.66667i 2.66667 - 0.00000i 0.00000 -
1.33333i
% 0.00000 + 0.00000i 1.33333 + 0.66667i 0.00000 + 1.33333i 1.33333 -
0.00000i
%
% % MATLAB 2014A
%
% R =
%
% 2.6667 + 0.0000i -0.6667 + 0.6667i 0.0000 + 0.0000i 0.0000 +
0.0000i
% -0.6667 - 0.6667i 2.3333 + 0.0000i 0.6667 - 0.6667i 1.3333 +
0.6667i
% 0.0000 + 0.0000i 0.6667 + 0.6667i 2.6667 + 0.0000i 0.0000 +
1.3333i
% 0.0000 + 0.0000i 1.3333 - 0.6667i 0.0000 - 1.3333i 1.3333 + 0.0000i
_______________________________________________________
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<http://savannah.gnu.org/bugs/?48315>
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- [Octave-bug-tracker] [bug #48315] cov.m: Incorrect result,
Ryan Thompson <=