!>
!> 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.
!> 

N

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

X

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

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