cung2r(3P) Sun Performance Library cung2r(3P)NAMEcung2r - generate an m by n complex matrix Q with orthonormal columns,
SYNOPSIS
SUBROUTINE CUNG2R(M, N, K, A, LDA, TAU, WORK, INFO)
COMPLEX A(LDA,*), TAU(*), WORK(*)
INTEGER M, N, K, LDA, INFO
SUBROUTINE CUNG2R_64(M, N, K, A, LDA, TAU, WORK, INFO)
COMPLEX A(LDA,*), TAU(*), WORK(*)
INTEGER*8 M, N, K, LDA, INFO
F95 INTERFACE
SUBROUTINE UNG2R(M, [N], [K], A, [LDA], TAU, [WORK], [INFO])
COMPLEX, DIMENSION(:) :: TAU, WORK
COMPLEX, DIMENSION(:,:) :: A
INTEGER :: M, N, K, LDA, INFO
SUBROUTINE UNG2R_64(M, [N], [K], A, [LDA], TAU, [WORK], [INFO])
COMPLEX, DIMENSION(:) :: TAU, WORK
COMPLEX, DIMENSION(:,:) :: A
INTEGER(8) :: M, N, K, LDA, INFO
C INTERFACE
#include <sunperf.h>
void cung2r(int m, int n, int k, complex *a, int lda, complex *tau, int
*info);
void cung2r_64(long m, long n, long k, complex *a, long lda, complex
*tau, long *info);
PURPOSEcung2r R generates an m by n complex 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 CGEQRF.
ARGUMENTS
M (input) The number of rows of the matrix Q. M >= 0.
N (input) The number of columns of the matrix Q. M >= N >= 0.
K (input) The number of elementary reflectors whose product defines the
matrix Q. N >= K >= 0.
A (input/output)
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 CGEQRF in the first k columns of its array argu‐
ment 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 elementary
reflector H(i), as returned by CGEQRF.
WORK (workspace)
dimension(N)
INFO (output)
= 0: successful exit
< 0: if INFO = -i, the i-th argument has an illegal value
6 Mar 2009 cung2r(3P)
