dlapll man page on YellowDog

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DLAPLL(l)			       )			     DLAPLL(l)

NAME
       DLAPLL - two column vectors X and Y, let	 A = ( X Y )

SYNOPSIS
       SUBROUTINE DLAPLL( N, X, INCX, Y, INCY, SSMIN )

	   INTEGER	  INCX, INCY, N

	   DOUBLE	  PRECISION SSMIN

	   DOUBLE	  PRECISION X( * ), Y( * )

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.

ARGUMENTS
       N       (input) INTEGER
	       The length of the vectors X and Y.

       X       (input/output) DOUBLE PRECISION 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) DOUBLE PRECISION 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 ).

LAPACK version 3.0		 15 June 2000			     DLAPLL(l)
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