GNU/Linux man pages
Livre :
Expressions régulières,
Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 4.8 |
i386 |
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cungr2(l) |
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CUNGR2 - generate an m by n complex matrix Q with orthonormal rows,
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SUBROUTINE CUNGR2( |
M, N, K, A, LDA, TAU, WORK, INFO ) |
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INTEGER |
INFO, K, LDA, M, N |
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COMPLEX |
A( LDA, * ), TAU( * ), WORK( * ) |
CUNGR2 generates an m by n complex matrix Q with orthonormal rows, which is defined as the last m rows of a product of k elementary reflectors of order n
Q = H(1)’ H(2)’ . . . H(k)’
as returned by CGERQF.
M (input) INTEGER
The number of rows of the matrix Q. M >= 0.
N (input) INTEGER
The number of columns of the matrix Q. N >= M.
K (input) INTEGER
The number of elementary reflectors whose product defines the matrix Q. M >= K >= 0.
A (input/output) COMPLEX array, dimension (LDA,N)
On entry, the (m-k+i)-th row must contain the vector which defines the elementary reflector H(i), for i = 1,2,...,k, as returned by CGERQF in the last k rows 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 array, dimension (K)
TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by CGERQF.
WORK (workspace) COMPLEX array,
dimension (M)
INFO (output) INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument has an illegal
value
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cungr2(l) | |