Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
lis_array_qr(3)		     Lis Library Functions	       lis_array_qr(3)

NAME
       lis_array_qr - calculate	the eigenvalues	with the QR algorithm

SYNOPSIS
       #include	"lis.h"

       LIS_INT	 lis_array_qr(LIS_INT	n,  LIS_SCALAR	a[],  LIS_SCALAR  q[],
       LIS_SCALAR r[], LIS_INT *qriter,	LIS_SCALAR *qrerr);

DESCRIPTION
       Calculate the eigenvalues of matrix A with the QR algorithm.

INPUT
       n      The size of the matrices

       a      The array	that stores matrix A of	size n * n

       q      The work array Q of size n * n

       r      The work array R of size n * n

OUTPUT
       a      The array	that stores the	block upper-triangular matrix with ei-
	      genvalues	in the block diagonal elements after similarity	trans-
	      formation

       qriter The number of iterations of the QR algorithm

       qrerr  The 2-norm of the	first subdiagonal element A(2,1)  after	 simi-
	      larity transformation

EXIT STATUS
       The following exit values are returned:

       0      The process is normally terminated

       unspecified
	      An error occurred

SEE ALSO
       lis(3)

       http://www.ssisc.org/lis/

Man Page			  1 Nov	2014		       lis_array_qr(3)

NAME | SYNOPSIS | DESCRIPTION | INPUT | OUTPUT | EXIT STATUS | SEE ALSO

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=lis_array_qr&sektion=3&manpath=FreeBSD+12.2-RELEASE+and+Ports>

home | help