SUBROUTINE CHECON( UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, * INFO) CHARACTER * 1 UPLO COMPLEX A(LDA,*), WORK(*) INTEGER N, LDA, INFO INTEGER IPIVOT(*) REAL ANORM, RCOND SUBROUTINE CHECON_64( UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, * INFO) CHARACTER * 1 UPLO COMPLEX A(LDA,*), WORK(*) INTEGER*8 N, LDA, INFO INTEGER*8 IPIVOT(*) REAL ANORM, RCOND
SUBROUTINE HECON( UPLO, [N], A, [LDA], IPIVOT, ANORM, RCOND, [WORK], * [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX, DIMENSION(:) :: WORK COMPLEX, DIMENSION(:,:) :: A INTEGER :: N, LDA, INFO INTEGER, DIMENSION(:) :: IPIVOT REAL :: ANORM, RCOND SUBROUTINE HECON_64( UPLO, [N], A, [LDA], IPIVOT, ANORM, RCOND, * [WORK], [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX, DIMENSION(:) :: WORK COMPLEX, DIMENSION(:,:) :: A INTEGER(8) :: N, LDA, INFO INTEGER(8), DIMENSION(:) :: IPIVOT REAL :: ANORM, RCOND
void checon(char uplo, int n, complex *a, int lda, int *ipivot, float anorm, float *rcond, int *info);
void checon_64(char uplo, long n, complex *a, long lda, 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))).