SUBROUTINE ZUNGBR( VECT, M, N, K, A, LDA, TAU, WORK, LWORK, INFO) CHARACTER * 1 VECT DOUBLE COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER M, N, K, LDA, LWORK, INFO SUBROUTINE ZUNGBR_64( VECT, M, N, K, A, LDA, TAU, WORK, LWORK, INFO) CHARACTER * 1 VECT DOUBLE COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER*8 M, N, K, LDA, LWORK, INFO
SUBROUTINE UNGBR( VECT, M, [N], K, A, [LDA], TAU, [WORK], [LWORK], * [INFO]) CHARACTER(LEN=1) :: VECT COMPLEX(8), DIMENSION(:) :: TAU, WORK COMPLEX(8), DIMENSION(:,:) :: A INTEGER :: M, N, K, LDA, LWORK, INFO SUBROUTINE UNGBR_64( VECT, M, [N], K, A, [LDA], TAU, [WORK], [LWORK], * [INFO]) CHARACTER(LEN=1) :: VECT COMPLEX(8), DIMENSION(:) :: TAU, WORK COMPLEX(8), DIMENSION(:,:) :: A INTEGER(8) :: M, N, K, LDA, LWORK, INFO
void zungbr(char vect, int m, int n, int k, doublecomplex *a, int lda, doublecomplex *tau, int *info);
void zungbr_64(char vect, long m, long n, long k, doublecomplex *a, long lda, doublecomplex *tau, long *info);
If VECT = 'Q', A is assumed to have been an M-by-K matrix, and Q is of order M:
if m >= k, Q = H(1) H(2) . . . H(k) and CUNGBR returns the first n columns of Q, where m >= n >= k;
if m < k, Q = H(1) H(2) . . . H(m-1) and CUNGBR returns Q as an M-by-M matrix.
If VECT = 'P', A is assumed to have been a K-by-N matrix, and P**H is of order N:
if k < n, P**H = G(k) . . . G(2) G(1) and CUNGBR returns the first m rows of P**H, where n >= m >= k;
if k >= n, P**H = G(n-1) . . . G(2) G(1) and CUNGBR returns P**H as an N-by-N matrix.
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.