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zlapll.f(3) LAPACK zlapll.f(3)

zlapll.f -


subroutine zlapll (N, X, INCX, Y, INCY, SSMIN)
 
ZLAPLL measures the linear dependence of two vectors.

ZLAPLL 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 COMPLEX*16 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 COMPLEX*16 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.
Date:
September 2012
Definition at line 101 of file zlapll.f.

Generated automatically by Doxygen for LAPACK from the source code.
Sat Nov 16 2013 Version 3.4.2

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