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zlapll (3)
  • >> zlapll (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         zlapll - two column vectors X and Y, let   A = ( X Y )
    
    SYNOPSIS
         SUBROUTINE ZLAPLL( N, X, INCX, Y, INCY, SSMIN )
    
         INTEGER INCX, INCY, N
    
         DOUBLE PRECISION SSMIN
    
         COMPLEX*16 X( * ), Y( * )
    
    
    
         #include <sunperf.h>
    
         void zlapll(int n, doublecomplex *zx, int  incx,  doublecom-
                   plex *zy, int incy, double *ssmin) ;
    
    PURPOSE
         Given two column vectors X and Y, let
    
         The subroutine first computes the QR factorization  of  A  =
         Q*R,  and then computes the SVD of the 2-by-2 upper triangu-
         lar matrix R.  The smaller singular value of R  is  returned
         in  SSMIN,  which  is  used as the measurement of the linear
         dependency of the vectors X and Y.
    
    
    ARGUMENTS
         N         (input) INTEGER
                   The length of the vectors X and Y.
    
         X         (input/output) COMPLEX*16 array, dimension  (1+(N-
                   1)*INCX)
                   On entry, X contains the N-vector X.  On  exit,  X
                   is overwritten.
    
         INCX      (input) INTEGER
                   The increment between successive  elements  of  X.
                   INCX > 0.
    
         Y         (input/output) COMPLEX*16 array, dimension  (1+(N-
                   1)*INCY)
                   On entry, Y contains the N-vector Y.  On  exit,  Y
                   is overwritten.
    
         INCY      (input) INTEGER
                   The increment between successive  elements  of  Y.
                   INCY > 0.
    
         SSMIN     (output) DOUBLE PRECISION
                   The smallest singular value of the N-by-2 matrix A
                   = ( X Y ).
    
    
    
    


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