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slaed5 (3)
  • >> slaed5 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         slaed5 - subroutine computes the I-th eigenvalue of  a  sym-
         metric  rank-one  modification  of  a 2-by-2 diagonal matrix
         diag( D ) + RHO  The diagonal elements in the  array  D  are
         assumed to satisfy   D(i) < D(j) for i < j
    
    SYNOPSIS
         SUBROUTINE SLAED5( I, D, Z, DELTA, RHO, DLAM )
    
         INTEGER I
    
         REAL DLAM, RHO
    
         REAL D( 2 ), DELTA( 2 ), Z( 2 )
    
    
    
         #include <sunperf.h>
    
         void slaed5(int i, float *d, float *sz, float *delta,  float
                   srho, float *dlam) ;
    
    PURPOSE
         This subroutine computes the I-th eigenvalue of a  symmetric
         rank-one modification of a 2-by-2 diagonal matrix
    
         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  neces-
                   sary 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  eigen-
                   value.
    
    


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