zlapll.f (3)  Linux Manuals
NAME
zlapll.f 
SYNOPSIS
Functions/Subroutines
subroutine zlapll (N, X, INCX, Y, INCY, SSMIN)
ZLAPLL measures the linear dependence of two vectors.
Function/Subroutine Documentation
subroutine zlapll (integerN, complex*16, dimension( * )X, integerINCX, complex*16, dimension( * )Y, integerINCY, double precisionSSMIN)
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 2by2 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.
XX is COMPLEX*16 array, dimension (1+(N1)*INCX) On entry, X contains the Nvector X. On exit, X is overwritten.
INCXINCX is INTEGER The increment between successive elements of X. INCX > 0.
YY is COMPLEX*16 array, dimension (1+(N1)*INCY) On entry, Y contains the Nvector Y. On exit, Y is overwritten.
INCYINCY is INTEGER The increment between successive elements of Y. INCY > 0.
SSMINSSMIN is DOUBLE PRECISION The smallest singular value of the Nby2 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.
Author
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