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template<typename T>
void orgl2(integer *m, integer *n, integer *k, T *a, integer *lda, T *tau, T *work, integer *info)# ORGL2 generates an m by n real matrix Q with orthonormal rows.
Purpose:
ORGL2 generates an m by n real matrix Q with orthonormal rows, which is defined as the first m rows of a product of k elementary reflectors of order n Q = H(k) . . . H(2) H(1) as returned by GELQF.
- Parameters:
M – [in]
M is INTEGER
The number of rows of the matrix Q. M >= 0.
N – [in]
N is INTEGER
The number of columns of the matrix Q. N >= M.
K – [in]
K is INTEGER
The number of elementary reflectors whose product defines the matrix Q. M >= K >= 0.
A – [inout]
A is REAL array, dimension (LDA,N)
On entry, the i-th row must contain the vector which defines the elementary reflector H(i), for i = 1,2,…,k, as returned by SGELQF in the first k rows of its array argument A.
On exit, the m-by-n matrix Q.LDA – [in]
LDA is INTEGER
The first dimension of the array A. LDA >= fla_max(1,M).
TAU – [in]
TAU is REAL array, dimension (K)
TAU(i) must contain the scalar factor of the elementary reflector H(i), as returned by SGELQF.
WORK – [out] WORK is REAL array, dimension (M)
INFO – [out]
INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument has an illegal value