ssycon - estimate the reciprocal of the condition number (in the 1-norm) of a real symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by SSYTRF
SUBROUTINE SSYCON(UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, IWORK2, INFO) CHARACTER*1 UPLO INTEGER N, LDA, INFO INTEGER IPIVOT(*), IWORK2(*) REAL ANORM, RCOND REAL A(LDA,*), WORK(*) SUBROUTINE SSYCON_64(UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, IWORK2, INFO) CHARACTER*1 UPLO INTEGER*8 N, LDA, INFO INTEGER*8 IPIVOT(*), IWORK2(*) REAL ANORM, RCOND REAL A(LDA,*), WORK(*) F95 INTERFACE 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 :: ANORM, RCOND REAL, DIMENSION(:) :: WORK REAL, 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 :: ANORM, RCOND REAL, DIMENSION(:) :: WORK REAL, DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void ssycon(char uplo, int n, float *a, int lda, int *ipivot, float anorm, float *rcond, int *info); void ssycon_64(char uplo, long n, float *a, long lda, long *ipivot, float anorm, float *rcond, long *info);
Oracle Solaris Studio Performance Library ssycon(3P) NAME ssycon - estimate the reciprocal of the condition number (in the 1-norm) of a real symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by SSYTRF SYNOPSIS SUBROUTINE SSYCON(UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, IWORK2, INFO) CHARACTER*1 UPLO INTEGER N, LDA, INFO INTEGER IPIVOT(*), IWORK2(*) REAL ANORM, RCOND REAL A(LDA,*), WORK(*) SUBROUTINE SSYCON_64(UPLO, N, A, LDA, IPIVOT, ANORM, RCOND, WORK, IWORK2, INFO) CHARACTER*1 UPLO INTEGER*8 N, LDA, INFO INTEGER*8 IPIVOT(*), IWORK2(*) REAL ANORM, RCOND REAL A(LDA,*), WORK(*) F95 INTERFACE 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 :: ANORM, RCOND REAL, DIMENSION(:) :: WORK REAL, 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 :: ANORM, RCOND REAL, DIMENSION(:) :: WORK REAL, DIMENSION(:,:) :: A C INTERFACE #include <sunperf.h> void ssycon(char uplo, int n, float *a, int lda, int *ipivot, float anorm, float *rcond, int *info); void ssycon_64(char uplo, long n, float *a, long lda, long *ipivot, float anorm, float *rcond, long *info); PURPOSE ssycon estimates the reciprocal of the condition number (in the 1-norm) of a real symmetric matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by SSYTRF. An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))). ARGUMENTS UPLO (input) Specifies whether the details of the factorization are stored as an upper or lower triangular matrix. = 'U': Upper trian- gular, form is A = U*D*U**T; = 'L': Lower triangular, form is A = L*D*L**T. N (input) The order of the matrix A. N >= 0. A (input) The block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by SSYTRF. LDA (input) The leading dimension of the array A. LDA >= max(1,N). IPIVOT (input) INTEGER array, dimension (N) Details of the interchanges and the block structure of D as determined by SSYTRF. ANORM (input) The 1-norm of the original matrix A. RCOND (output) The reciprocal of the condition number of the matrix A, com- puted as RCOND = 1/(ANORM * AINVNM), where AINVNM is an esti- mate of the 1-norm of inv(A) computed in this routine. WORK (workspace) dimension(2*N) IWORK2 (workspace) INTEGER array, dimension (N) INFO (output) = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value 7 Nov 2015 ssycon(3P)