checon - estimate the reciprocal of the condition number of a complex Hermitian matrix A using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF
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
#include <sunperf.h>
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);
checon estimates the reciprocal of the condition number of a complex Hermitian matrix A using the factorization A = U*D*U**H or A = L*D*L**H computed by CHETRF.
An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).
= 'L': Lower triangular, form is A = L*D*L**H.
inv(A)
computed in this routine.
dimension(2*N)
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value