cungrq - 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
SUBROUTINE CUNGRQ(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER M, N, K, LDA, LWORK, INFO SUBROUTINE CUNGRQ_64(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER*8 M, N, K, LDA, LWORK, INFO F95 INTERFACE SUBROUTINE UNGRQ(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX, DIMENSION(:) :: TAU, WORK COMPLEX, DIMENSION(:,:) :: A INTEGER :: M, N, K, LDA, LWORK, INFO SUBROUTINE UNGRQ_64(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX, DIMENSION(:) :: TAU, WORK COMPLEX, DIMENSION(:,:) :: A INTEGER(8) :: M, N, K, LDA, LWORK, INFO C INTERFACE #include <sunperf.h> void cungrq(int m, int n, int k, complex *a, int lda, complex *tau, int *info); void cungrq_64(long m, long n, long k, complex *a, long lda, complex *tau, long *info);
Oracle Solaris Studio Performance Library cungrq(3P) NAME cungrq - generate 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 SYNOPSIS SUBROUTINE CUNGRQ(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER M, N, K, LDA, LWORK, INFO SUBROUTINE CUNGRQ_64(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER*8 M, N, K, LDA, LWORK, INFO F95 INTERFACE SUBROUTINE UNGRQ(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX, DIMENSION(:) :: TAU, WORK COMPLEX, DIMENSION(:,:) :: A INTEGER :: M, N, K, LDA, LWORK, INFO SUBROUTINE UNGRQ_64(M, N, K, A, LDA, TAU, WORK, LWORK, INFO) COMPLEX, DIMENSION(:) :: TAU, WORK COMPLEX, DIMENSION(:,:) :: A INTEGER(8) :: M, N, K, LDA, LWORK, INFO C INTERFACE #include <sunperf.h> void cungrq(int m, int n, int k, complex *a, int lda, complex *tau, int *info); void cungrq_64(long m, long n, long k, complex *a, long lda, complex *tau, long *info); PURPOSE cungrq 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) On exit, if INFO = 0, WORK(1) returns the optimal LWORK. LWORK (input) The dimension of the array WORK. LWORK >= max(1,M). For optimum performance LWORK >= M*NB, where NB is the optimal blocksize. If LWORK = -1, then a workspace query is assumed; the routine only calculates the optimal size of the WORK array, returns this value as the first entry of the WORK array, and no error message related to LWORK is issued by XERBLA. INFO (output) = 0: successful exit < 0: if INFO = -i, the i-th argument has an illegal value 7 Nov 2015 cungrq(3P)