SUBROUTINE ZSTEDC( COMPZ, N, D, E, Z, LDZ, WORK, LWORK, RWORK, * LRWORK, IWORK, LIWORK, INFO) CHARACTER * 1 COMPZ DOUBLE COMPLEX Z(LDZ,*), WORK(*) INTEGER N, LDZ, LWORK, LRWORK, LIWORK, INFO INTEGER IWORK(*) DOUBLE PRECISION D(*), E(*), RWORK(*) SUBROUTINE ZSTEDC_64( COMPZ, N, D, E, Z, LDZ, WORK, LWORK, RWORK, * LRWORK, IWORK, LIWORK, INFO) CHARACTER * 1 COMPZ DOUBLE COMPLEX Z(LDZ,*), WORK(*) INTEGER*8 N, LDZ, LWORK, LRWORK, LIWORK, INFO INTEGER*8 IWORK(*) DOUBLE PRECISION D(*), E(*), RWORK(*)
SUBROUTINE STEDC( COMPZ, [N], D, E, Z, [LDZ], [WORK], [LWORK], * [RWORK], [LRWORK], [IWORK], [LIWORK], [INFO]) CHARACTER(LEN=1) :: COMPZ COMPLEX(8), DIMENSION(:) :: WORK COMPLEX(8), DIMENSION(:,:) :: Z INTEGER :: N, LDZ, LWORK, LRWORK, LIWORK, INFO INTEGER, DIMENSION(:) :: IWORK REAL(8), DIMENSION(:) :: D, E, RWORK SUBROUTINE STEDC_64( COMPZ, [N], D, E, Z, [LDZ], [WORK], [LWORK], * [RWORK], [LRWORK], [IWORK], [LIWORK], [INFO]) CHARACTER(LEN=1) :: COMPZ COMPLEX(8), DIMENSION(:) :: WORK COMPLEX(8), DIMENSION(:,:) :: Z INTEGER(8) :: N, LDZ, LWORK, LRWORK, LIWORK, INFO INTEGER(8), DIMENSION(:) :: IWORK REAL(8), DIMENSION(:) :: D, E, RWORK
void zstedc(char compz, int n, double *d, double *e, doublecomplex *z, int ldz, int *info);
void zstedc_64(char compz, long n, double *d, double *e, doublecomplex *z, long ldz, long *info);
This code makes very mild assumptions about floating point arithmetic. It will work on machines with a guard digit in add/subtract, or on those binary machines without guard digits which subtract like the Cray X-MP, Cray Y-MP, Cray C-90, or Cray-2. It could conceivably fail on hexadecimal or decimal machines without guard digits, but we know of none. See SLAED3 for details.
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.
If LRWORK = -1, then a workspace query is assumed; the routine only calculates the optimal size of the RWORK array, returns this value as the first entry of the RWORK array, and no error message related to LRWORK is issued by XERBLA.
If LIWORK = -1, then a workspace query is assumed; the routine only calculates the optimal size of the IWORK array, returns this value as the first entry of the IWORK array, and no error message related to LIWORK is issued by XERBLA.