SUBROUTINE ZUNGTR( UPLO, N, A, LDA, TAU, WORK, LWORK, INFO) CHARACTER * 1 UPLO DOUBLE COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER N, LDA, LWORK, INFO SUBROUTINE ZUNGTR_64( UPLO, N, A, LDA, TAU, WORK, LWORK, INFO) CHARACTER * 1 UPLO DOUBLE COMPLEX A(LDA,*), TAU(*), WORK(*) INTEGER*8 N, LDA, LWORK, INFO
SUBROUTINE UNGTR( UPLO, [N], A, [LDA], TAU, [WORK], [LWORK], [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX(8), DIMENSION(:) :: TAU, WORK COMPLEX(8), DIMENSION(:,:) :: A INTEGER :: N, LDA, LWORK, INFO SUBROUTINE UNGTR_64( UPLO, [N], A, [LDA], TAU, [WORK], [LWORK], * [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX(8), DIMENSION(:) :: TAU, WORK COMPLEX(8), DIMENSION(:,:) :: A INTEGER(8) :: N, LDA, LWORK, INFO
void zungtr(char uplo, int n, doublecomplex *a, int lda, doublecomplex *tau, int *info);
void zungtr_64(char uplo, long n, doublecomplex *a, long lda, doublecomplex *tau, long *info);
if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),
if UPLO = 'L', Q = H(1) H(2) . . . H(n-1).
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.