SUBROUTINE DLARZ( SIDE, M, N, L, V, INCV, TAU, C, LDC, WORK) CHARACTER * 1 SIDE INTEGER M, N, L, INCV, LDC DOUBLE PRECISION TAU DOUBLE PRECISION V(*), C(LDC,*), WORK(*) SUBROUTINE DLARZ_64( SIDE, M, N, L, V, INCV, TAU, C, LDC, WORK) CHARACTER * 1 SIDE INTEGER*8 M, N, L, INCV, LDC DOUBLE PRECISION TAU DOUBLE PRECISION V(*), C(LDC,*), WORK(*)
SUBROUTINE LARZ( SIDE, [M], [N], L, V, [INCV], TAU, C, [LDC], [WORK]) CHARACTER(LEN=1) :: SIDE INTEGER :: M, N, L, INCV, LDC REAL(8) :: TAU REAL(8), DIMENSION(:) :: V, WORK REAL(8), DIMENSION(:,:) :: C SUBROUTINE LARZ_64( SIDE, [M], [N], L, V, [INCV], TAU, C, [LDC], * [WORK]) CHARACTER(LEN=1) :: SIDE INTEGER(8) :: M, N, L, INCV, LDC REAL(8) :: TAU REAL(8), DIMENSION(:) :: V, WORK REAL(8), DIMENSION(:,:) :: C
void dlarz(char side, int m, int n, int l, double *v, int incv, double tau, double *c, int ldc);
void dlarz_64(char side, long m, long n, long l, double *v, long incv, double tau, double *c, long ldc);
H = I - tau * v * v'
where tau is a real scalar and v is a real vector.
If tau = 0, then H is taken to be the unit matrix.
H is a product of k elementary reflectors as returned by STZRZF.
A. Petitet, Computer Science Dept., Univ. of Tenn., Knoxville, USA