
NAMEzlapll.f SYNOPSISFunctions/Subroutinessubroutine zlapll (N, X, INCX, Y, INCY, SSMIN) Function/Subroutine Documentationsubroutine 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. N
Author:
N is INTEGER The length of the vectors X and Y.X X is COMPLEX*16 array, dimension (1+(N1)*INCX) On entry, X contains the Nvector 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+(N1)*INCY) On entry, Y contains the Nvector 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 Nby2 matrix A = ( X Y ). Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 101 of file zlapll.f.
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