SUBROUTINE DSYCON( UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, * IWORK2, INFO) CHARACTER * 1 UPLO INTEGER N, LDA, INFO INTEGER IPIVOT(*), IWORK2(*) DOUBLE PRECISION ANORM, RCOND DOUBLE PRECISION A(LDA,*), WORK(*) SUBROUTINE DSYCON_64( UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, * IWORK2, INFO) CHARACTER * 1 UPLO INTEGER*8 N, LDA, INFO INTEGER*8 IPIVOT(*), IWORK2(*) DOUBLE PRECISION ANORM, RCOND DOUBLE PRECISION A(LDA,*), WORK(*)
SUBROUTINE SYCON( UPLO, N, A, [LDA], IPIVOT, ANORM, RCOND, [WORK], * [IWORK2], [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER :: N, LDA, INFO INTEGER, DIMENSION(:) :: IPIVOT, IWORK2 REAL(8) :: ANORM, RCOND REAL(8), DIMENSION(:) :: WORK REAL(8), DIMENSION(:,:) :: A SUBROUTINE SYCON_64( UPLO, N, A, [LDA], IPIVOT, ANORM, RCOND, [WORK], * [IWORK2], [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, LDA, INFO INTEGER(8), DIMENSION(:) :: IPIVOT, IWORK2 REAL(8) :: ANORM, RCOND REAL(8), DIMENSION(:) :: WORK REAL(8), DIMENSION(:,:) :: A
void dsycon(char uplo, int n, double *a, int lda, int *ipivot, double anorm, double *rcond, int *info);
void dsycon_64(char uplo, long n, double *a, long lda, long *ipivot, double anorm, double *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))).