SUBROUTINE ZLARZ( SIDE, M, N, L, V, INCV, TAU, C, LDC, WORK) CHARACTER * 1 SIDE DOUBLE COMPLEX TAU DOUBLE COMPLEX V(*), C(LDC,*), WORK(*) INTEGER M, N, L, INCV, LDC SUBROUTINE ZLARZ_64( SIDE, M, N, L, V, INCV, TAU, C, LDC, WORK) CHARACTER * 1 SIDE DOUBLE COMPLEX TAU DOUBLE COMPLEX V(*), C(LDC,*), WORK(*) INTEGER*8 M, N, L, INCV, LDC
SUBROUTINE LARZ( SIDE, [M], [N], L, V, [INCV], TAU, C, [LDC], [WORK]) CHARACTER(LEN=1) :: SIDE COMPLEX(8) :: TAU COMPLEX(8), DIMENSION(:) :: V, WORK COMPLEX(8), DIMENSION(:,:) :: C INTEGER :: M, N, L, INCV, LDC SUBROUTINE LARZ_64( SIDE, [M], [N], L, V, [INCV], TAU, C, [LDC], * [WORK]) CHARACTER(LEN=1) :: SIDE COMPLEX(8) :: TAU COMPLEX(8), DIMENSION(:) :: V, WORK COMPLEX(8), DIMENSION(:,:) :: C INTEGER(8) :: M, N, L, INCV, LDC
void zlarz(char side, int m, int n, int l, doublecomplex *v, int incv, doublecomplex tau, doublecomplex *c, int ldc);
void zlarz_64(char side, long m, long n, long l, doublecomplex *v, long incv, doublecomplex tau, doublecomplex *c, long ldc);
H = I - tau * v * v'
where tau is a complex scalar and v is a complex vector.
If tau = 0, then H is taken to be the unit matrix.
To apply H' (the conjugate transpose of H), supply conjg(tau) instead tau.
H is a product of k elementary reflectors as returned by CTZRZF.
A. Petitet, Computer Science Dept., Univ. of Tenn., Knoxville, USA