SUBROUTINE SSPCON( UPLO, N, A, IPIVOT, ANORM, RCOND, WORK, IWORK2, * INFO) CHARACTER * 1 UPLO INTEGER N, INFO INTEGER IPIVOT(*), IWORK2(*) REAL ANORM, RCOND REAL A(*), WORK(*) SUBROUTINE SSPCON_64( UPLO, N, A, IPIVOT, ANORM, RCOND, WORK, * IWORK2, INFO) CHARACTER * 1 UPLO INTEGER*8 N, INFO INTEGER*8 IPIVOT(*), IWORK2(*) REAL ANORM, RCOND REAL A(*), WORK(*)
SUBROUTINE SPCON( UPLO, [N], A, IPIVOT, ANORM, RCOND, [WORK], * [IWORK2], [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INFO INTEGER, DIMENSION(:) :: IPIVOT, IWORK2 REAL :: ANORM, RCOND REAL, DIMENSION(:) :: A, WORK SUBROUTINE SPCON_64( UPLO, [N], A, IPIVOT, ANORM, RCOND, [WORK], * [IWORK2], [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INFO INTEGER(8), DIMENSION(:) :: IPIVOT, IWORK2 REAL :: ANORM, RCOND REAL, DIMENSION(:) :: A, WORK
void sspcon(char uplo, int n, float *a, int *ipivot, float anorm, float *rcond, int *info);
void sspcon_64(char uplo, long n, float *a, long *ipivot, float anorm, float *rcond, long *info);
An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).