GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
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zlapll(l) |
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ZLAPLL - two column vectors X and Y, let A = ( X Y )
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SUBROUTINE ZLAPLL( |
N, X, INCX, Y, INCY, SSMIN ) |
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INTEGER |
INCX, INCY, N |
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DOUBLE |
PRECISION SSMIN |
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COMPLEX*16 |
X( * ), Y( * ) |
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 (input) INTEGER
The length of the vectors X and Y.
X (input/output) COMPLEX*16 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) COMPLEX*16 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) DOUBLE PRECISION
The smallest singular value of the N-by-2 matrix A = ( X Y ).
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zlapll(l) | |