GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
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zung2l(l) |
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ZUNG2L - generate an m by n complex matrix Q with orthonormal columns,
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SUBROUTINE ZUNG2L( |
M, N, K, A, LDA, TAU, WORK, INFO ) |
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INTEGER |
INFO, K, LDA, M, N |
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COMPLEX*16 |
A( LDA, * ), TAU( * ), WORK( * ) |
ZUNG2L generates an m by n complex matrix Q with orthonormal columns, which is defined as the last n columns of a product of k elementary reflectors of order m
Q = H(k) . . . H(2) H(1)
as returned by ZGEQLF.
M (input) INTEGER
The number of rows of the matrix Q. M >= 0.
N (input) INTEGER
The number of columns of the matrix Q. M >= N >= 0.
K (input) INTEGER
The number of elementary reflectors whose product defines the matrix Q. N >= K >= 0.
A (input/output) COMPLEX*16 array, dimension (LDA,N)
On entry, the (n-k+i)-th column must contain the vector which defines the elementary reflector H(i), for i = 1,2,...,k, as returned by ZGEQLF in the last k columns of its array argument A. On exit, the m-by-n matrix Q.
LDA (input) INTEGER
The first dimension of the array A. LDA >= max(1,M).
TAU (input) COMPLEX*16 array, dimension (K)
TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by ZGEQLF.
WORK (workspace) COMPLEX*16
array, dimension (N)
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument has an illegal
value
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zung2l(l) | |