Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

RedHat 9 (Linux i386) - man page for slaed5 (redhat section l)

SLAED5(l)						  )						    SLAED5(l)

NAME
SLAED5 - subroutine computes the I-th eigenvalue of a symmetric rank-one modification of a 2-by-2 diagonal matrix diag( D ) + RHO * Z * transpose(Z)
SYNOPSIS
SUBROUTINE SLAED5( I, D, Z, DELTA, RHO, DLAM ) INTEGER I REAL DLAM, RHO REAL D( 2 ), DELTA( 2 ), Z( 2 )
PURPOSE
This subroutine computes the I-th eigenvalue of a symmetric rank-one modification of a 2-by-2 diagonal matrix diag( D ) + RHO * Z * transpose(Z) . The diagonal elements in the array D are assumed to satisfy D(i) < D(j) for i < j . We also assume RHO > 0 and that the Euclidean norm of the vector Z is one.
ARGUMENTS
I (input) INTEGER The index of the eigenvalue to be computed. I = 1 or I = 2. D (input) REAL array, dimension (2) The original eigenvalues. We assume D(1) < D(2). Z (input) REAL array, dimension (2) The components of the updating vector. DELTA (output) REAL array, dimension (2) The vector DELTA contains the information necessary to construct the eigenvectors. RHO (input) REAL The scalar in the symmetric updating formula. DLAM (output) REAL The computed lambda_I, the I-th updated eigenvalue.
FURTHER DETAILS
Based on contributions by Ren-Cang Li, Computer Science Division, University of California at Berkeley, USA LAPACK version 3.0 15 June 2000 SLAED5(l)


All times are GMT -4. The time now is 05:38 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password