SUBROUTINE SOPMTR( SIDE, UPLO, TRANS, M, N, AP, TAU, C, LDC, WORK, * INFO) CHARACTER * 1 SIDE, UPLO, TRANS INTEGER M, N, LDC, INFO REAL AP(*), TAU(*), C(LDC,*), WORK(*) SUBROUTINE SOPMTR_64( SIDE, UPLO, TRANS, M, N, AP, TAU, C, LDC, * WORK, INFO) CHARACTER * 1 SIDE, UPLO, TRANS INTEGER*8 M, N, LDC, INFO REAL AP(*), TAU(*), C(LDC,*), WORK(*)
SUBROUTINE OPMTR( SIDE, UPLO, [TRANS], [M], [N], AP, TAU, C, [LDC], * [WORK], [INFO]) CHARACTER(LEN=1) :: SIDE, UPLO, TRANS INTEGER :: M, N, LDC, INFO REAL, DIMENSION(:) :: AP, TAU, WORK REAL, DIMENSION(:,:) :: C SUBROUTINE OPMTR_64( SIDE, UPLO, [TRANS], [M], [N], AP, TAU, C, [LDC], * [WORK], [INFO]) CHARACTER(LEN=1) :: SIDE, UPLO, TRANS INTEGER(8) :: M, N, LDC, INFO REAL, DIMENSION(:) :: AP, TAU, WORK REAL, DIMENSION(:,:) :: C
void sopmtr(char side, char uplo, char trans, int m, int n, float *ap, float *tau, float *c, int ldc, int *info);
void sopmtr_64(char side, char uplo, char trans, long m, long n, float *ap, float *tau, float *c, long ldc, long *info);
where Q is a real orthogonal 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 SSPTRD using packed storage:
if UPLO = 'U', Q = H(nq-1) . . . H(2) H(1);
if UPLO = 'L', Q = H(1) H(2) . . . H(nq-1).