SRC/dlapll.f(3)            Library Functions Manual            SRC/dlapll.f(3)

NAME
       SRC/dlapll.f

SYNOPSIS
   Functions/Subroutines
       subroutine dlapll (n, x, incx, y, incy, ssmin)
           DLAPLL measures the linear dependence of two vectors.

Function/Subroutine Documentation
   subroutine dlapll (integer n, double precision, dimension( * ) x, integer
       incx, double precision, dimension( * ) y, integer incy, double
       precision ssmin)
       DLAPLL measures the linear dependence of two vectors.

       Purpose:


            Given two column vectors X and Y, let

                                 A = ( X Y ).

            The subroutine first computes the QR factorization of A = Q*R,
            and then computes the SVD of the 2-by-2 upper triangular 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.

       Parameters
           N

                     N is INTEGER
                     The length of the vectors X and Y.

           X

                     X is DOUBLE PRECISION array,
                                    dimension (1+(N-1)*INCX)
                     On entry, X contains the N-vector X.
                     On exit, X is overwritten.

           INCX

                     INCX is INTEGER
                     The increment between successive elements of X. INCX > 0.

           Y

                     Y is DOUBLE PRECISION array,
                                    dimension (1+(N-1)*INCY)
                     On entry, Y contains the N-vector Y.
                     On exit, Y is overwritten.

           INCY

                     INCY is INTEGER
                     The increment between successive elements of Y. INCY > 0.

           SSMIN

                     SSMIN is DOUBLE PRECISION
                     The smallest singular value of the N-by-2 matrix A = ( X Y ).

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 101 of file dlapll.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/dlapll.f(3)