SLAPLL man page on IRIX

SLAPLL man page on IRIX

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SLAPLL(3F)							    SLAPLL(3F)

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

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

	 INTEGER	INCX, INCY, N

	 REAL		SSMIN

	 REAL		X( * ), Y( * )

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 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) REAL 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) REAL 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) REAL
	     The smallest singular value of the N-by-2 matrix A = ( X Y ).

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