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RedHat 9 (Linux i386) - man page for dlapll (redhat section l)

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 over-
	       written.

       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 over-
	       written.

       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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