SUBROUTINE ZUNMTR( SIDE, UPLO, TRANS, M, N, A, LDA, TAU, C, LDC, * WORK, LWORK, INFO) CHARACTER * 1 SIDE, UPLO, TRANS DOUBLE COMPLEX A(LDA,*), TAU(*), C(LDC,*), WORK(*) INTEGER M, N, LDA, LDC, LWORK, INFO SUBROUTINE ZUNMTR_64( SIDE, UPLO, TRANS, M, N, A, LDA, TAU, C, LDC, * WORK, LWORK, INFO) CHARACTER * 1 SIDE, UPLO, TRANS DOUBLE COMPLEX A(LDA,*), TAU(*), C(LDC,*), WORK(*) INTEGER*8 M, N, LDA, LDC, LWORK, INFO
SUBROUTINE UNMTR( SIDE, UPLO, [TRANS], [M], [N], A, [LDA], TAU, C, * [LDC], [WORK], [LWORK], [INFO]) CHARACTER(LEN=1) :: SIDE, UPLO, TRANS COMPLEX(8), DIMENSION(:) :: TAU, WORK COMPLEX(8), DIMENSION(:,:) :: A, C INTEGER :: M, N, LDA, LDC, LWORK, INFO SUBROUTINE UNMTR_64( SIDE, UPLO, [TRANS], [M], [N], A, [LDA], TAU, * C, [LDC], [WORK], [LWORK], [INFO]) CHARACTER(LEN=1) :: SIDE, UPLO, TRANS COMPLEX(8), DIMENSION(:) :: TAU, WORK COMPLEX(8), DIMENSION(:,:) :: A, C INTEGER(8) :: M, N, LDA, LDC, LWORK, INFO
void zunmtr(char side, char uplo, char trans, int m, int n, doublecomplex *a, int lda, doublecomplex *tau, doublecomplex *c, int ldc, int *info);
void zunmtr_64(char side, char uplo, char trans, long m, long n, doublecomplex *a, long lda, doublecomplex *tau, doublecomplex *c, long ldc, long *info);
where Q is a complex unitary matrix of order nq, with nq = m if SIDE = 'L' and nq = n if SIDE = 'R'. Q is defined as the product of nq-1 elementary reflectors, as returned by CHETRD:
if UPLO = 'U', Q = H(nq-1) . . . H(2) H(1);
if UPLO = 'L', Q = H(1) H(2) . . . H(nq-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.