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dorg2r.f(3) | LAPACK | dorg2r.f(3) |
NAME¶
dorg2r.f -SYNOPSIS¶
Functions/Subroutines¶
subroutine dorg2r (M, N, K, A, LDA, TAU, WORK, INFO)
Function/Subroutine Documentation¶
subroutine dorg2r (integerM, integerN, integerK, double precision, dimension( lda, * )A, integerLDA, double precision, dimension( * )TAU, double precision, dimension( * )WORK, integerINFO)¶
DORG2R Purpose:DORG2R generates an m by n real matrix Q with orthonormal columns, which is defined as the first n columns of a product of k elementary reflectors of order m Q = H(1) H(2) . . . H(k) as returned by DGEQRF.
M
N
K
A
LDA
TAU
WORK
INFO
Author:
M is INTEGER The number of rows of the matrix Q. M >= 0.
N is INTEGER The number of columns of the matrix Q. M >= N >= 0.
K is INTEGER The number of elementary reflectors whose product defines the matrix Q. N >= K >= 0.
A is DOUBLE PRECISION array, dimension (LDA,N) On entry, the i-th column must contain the vector which defines the elementary reflector H(i), for i = 1,2,...,k, as returned by DGEQRF in the first k columns of its array argument A. On exit, the m-by-n matrix Q.
LDA is INTEGER The first dimension of the array A. LDA >= max(1,M).
TAU is DOUBLE PRECISION array, dimension (K) TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by DGEQRF.
WORK is DOUBLE PRECISION array, dimension (N)
INFO is INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument has an illegal value
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
November 2011
Author¶
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