From armin@approximity.com  Sat Jan  5 00:48:25 2002
From: armin@approximity.com (armin@approximity.com)
Date: Sat, 5 Jan 2002 01:48:25 +0100 (MET)
Subject: [Rd] possible bug in det using method="qr" (PR#1244)
Message-ID: <200201050048.BAA12656@pubhealth.ku.dk>

Full_Name: Armin Roehrl
Version: 1.4.0(2001-12-19)
OS: Linux; Suse 7.3
Submission from: (NULL) (217.84.18.204)


Hello,

On a given matrix det returns different results whether
I use the method "qr" or "eivenvalues".

The matrix:
> m2
             [,1]         [,2]        [,3]
[1,] 9.822616e+09 3.841723e+09    79790.09
[2,] 3.841723e+09 1.502536e+09    31251.82
[3,] 7.979009e+04 3.125182e+04 64156419.36

> det(m2, method="eigenvalues")
[1] -9.331893e+19


> det(m2, method="qr")
[1] 9.331893e+19

I think the result based on the eigenvalues is correct.

Good night.
	Armin

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[Rd] possible bug in det using method="qr" (PR#1244)
armin@approximity.com