Contents
sorgl2 - generate an m by n real matrix Q with orthonormal
rows,
SUBROUTINE SORGL2(M, N, K, A, LDA, TAU, WORK, INFO)
INTEGER M, N, K, LDA, INFO
REAL A(LDA,*), TAU(*), WORK(*)
SUBROUTINE SORGL2_64(M, N, K, A, LDA, TAU, WORK, INFO)
INTEGER*8 M, N, K, LDA, INFO
REAL A(LDA,*), TAU(*), WORK(*)
F95 INTERFACE
SUBROUTINE ORGL2([M], [N], [K], A, [LDA], TAU, [WORK], [INFO])
INTEGER :: M, N, K, LDA, INFO
REAL, DIMENSION(:) :: TAU, WORK
REAL, DIMENSION(:,:) :: A
SUBROUTINE ORGL2_64([M], [N], [K], A, [LDA], TAU, [WORK], [INFO])
INTEGER(8) :: M, N, K, LDA, INFO
REAL, DIMENSION(:) :: TAU, WORK
REAL, DIMENSION(:,:) :: A
C INTERFACE
#include <sunperf.h>
void sorgl2(int m, int n, int k, float *a, int lda, float
*tau, int *info);
void sorgl2_64(long m, long n, long k, float *a, long lda,
float *tau, long *info);
sorgl2 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 SGELQF.
M (input) The number of rows of the matrix Q. M >= 0.
N (input) The number of columns of the matrix Q. N >= M.
K (input) The number of elementary reflectors whose product
defines the matrix Q. M >= K >= 0.
A (input/output)
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 (input)
The first dimension of the array A. LDA >=
max(1,M).
TAU (input)
TAU(i) must contain the scalar factor of the ele-
mentary reflector H(i), as returned by SGELQF.
WORK (workspace)
dimension(M)
INFO (output)
= 0: successful exit
< 0: if INFO = -i, the i-th argument has an ille-
gal value