[ новости /+++ | форум | теги | ]

NAME
     dlasq4 - DLASQ4 estimates TAU, the smallest eigenvalue of  a
     matrix

SYNOPSIS
     SUBROUTINE DLASQ4( N, Q, E, TAU, SUP )

     INTEGER N

     DOUBLE PRECISION SUP, TAU

     DOUBLE PRECISION E( * ), Q( * )



     #include <sunperf.h>

     void dlasq4(int n, double *q, double *e, double *tau, double
               *sup) ;

PURPOSE
        DLASQ4  estimates  TAU,  the  smallest  eigenvalue  of  a
     matrix. This
        routine improves the input value of SUP which is an upper
     bound
        for the smallest eigenvalue for this matrix .


ARGUMENTS
     N         (input) INTEGER
               On entry, N  specifies  the  number  of  rows  and
               columns in the matrix. N must be at least 0.

     Q         (input) DOUBLE PRECISION array, dimension (N)
               Q array

     E         (input) DOUBLE PRECISION array, dimension (N)
               E array

     TAU       (output) DOUBLE PRECISION
               Estimate of the shift

     SUP       (input/output) DOUBLE PRECISION
               Upper bound for the smallest singular value

Партнёры:

Хостинг: