cungr2 - torization determined by cgerqf (unblocked algorithm)
SUBROUTINE CUNGR2(M, N, K, A, LDA, TAU, WORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER M, N, K, LDA, INFO SUBROUTINE CUNGR2_64(M, N, K, A, LDA, TAU, WORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER*8 M, N, K, LDA, INFO F95 INTERFACE SUBROUTINE UNGR2(M, N, K, A, LDA, TAU, WORK, INFO) COMPLEX, DIMENSION(:) :: TAU, WORK COMPLEX, DIMENSION(:,:) :: A INTEGER :: M, N, K, LDA, INFO SUBROUTINE UNGR2_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 cungr2(int m, int n, int k, complex *a, int lda, complex *tau, int *info); void cungr2_64(long m, long n, long k, complex *a, long lda, complex *tau, long *info);
Oracle Solaris Studio Performance Library cungr2(3P) NAME cungr2 - generate all or part of the unitary matrix Q from an RQ fac- torization determined by cgerqf (unblocked algorithm) SYNOPSIS SUBROUTINE CUNGR2(M, N, K, A, LDA, TAU, WORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER M, N, K, LDA, INFO SUBROUTINE CUNGR2_64(M, N, K, A, LDA, TAU, WORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER*8 M, N, K, LDA, INFO F95 INTERFACE SUBROUTINE UNGR2(M, N, K, A, LDA, TAU, WORK, INFO) COMPLEX, DIMENSION(:) :: TAU, WORK COMPLEX, DIMENSION(:,:) :: A INTEGER :: M, N, K, LDA, INFO SUBROUTINE UNGR2_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 cungr2(int m, int n, int k, complex *a, int lda, complex *tau, int *info); void cungr2_64(long m, long n, long k, complex *a, long lda, complex *tau, long *info); PURPOSE 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 * H(2)**H . . . H(K)**H as returned by CGERQF. ARGUMENTS 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 (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) 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 CGERQF. WORK (workspace) dimension(M) INFO (output) = 0: successful exit < 0: if INFO = -i, the i-th argument has an illegal value 7 Nov 2015 cungr2(3P)