stbcon (3p)

Name

stbcon - lar band matrix A, in either the 1-norm or the infinity-norm

Synopsis

SUBROUTINE STBCON(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND, WORK,
WORK2, INFO)

CHARACTER*1 NORM, UPLO, DIAG
INTEGER N, KD, LDA, INFO
INTEGER WORK2(*)
REAL RCOND
REAL A(LDA,*), WORK(*)

SUBROUTINE STBCON_64(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND, WORK,
WORK2, INFO)

CHARACTER*1 NORM, UPLO, DIAG
INTEGER*8 N, KD, LDA, INFO
INTEGER*8 WORK2(*)
REAL RCOND
REAL A(LDA,*), WORK(*)




F95 INTERFACE
SUBROUTINE TBCON(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND, WORK,
WORK2, INFO)

CHARACTER(LEN=1) :: NORM, UPLO, DIAG
INTEGER :: N, KD, LDA, INFO
INTEGER, DIMENSION(:) :: WORK2
REAL :: RCOND
REAL, DIMENSION(:) :: WORK
REAL, DIMENSION(:,:) :: A

SUBROUTINE TBCON_64(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND,
WORK, WORK2, INFO)

CHARACTER(LEN=1) :: NORM, UPLO, DIAG
INTEGER(8) :: N, KD, LDA, INFO
INTEGER(8), DIMENSION(:) :: WORK2
REAL :: RCOND
REAL, DIMENSION(:) :: WORK
REAL, DIMENSION(:,:) :: A




C INTERFACE
#include <sunperf.h>

void stbcon(char norm, char uplo, char diag, int n, int kd,  float  *a,
int lda, float *rcond, int *info);

void  stbcon_64(char norm, char uplo, char diag, long n, long kd, float
*a, long lda, float *rcond, long *info);

Description

Oracle Solaris Studio Performance Library                           stbcon(3P)



NAME
       stbcon  - estimate the reciprocal of the condition number of a triangu-
       lar band matrix A, in either the 1-norm or the infinity-norm


SYNOPSIS
       SUBROUTINE STBCON(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND, WORK,
             WORK2, INFO)

       CHARACTER*1 NORM, UPLO, DIAG
       INTEGER N, KD, LDA, INFO
       INTEGER WORK2(*)
       REAL RCOND
       REAL A(LDA,*), WORK(*)

       SUBROUTINE STBCON_64(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND, WORK,
             WORK2, INFO)

       CHARACTER*1 NORM, UPLO, DIAG
       INTEGER*8 N, KD, LDA, INFO
       INTEGER*8 WORK2(*)
       REAL RCOND
       REAL A(LDA,*), WORK(*)




   F95 INTERFACE
       SUBROUTINE TBCON(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND, WORK,
              WORK2, INFO)

       CHARACTER(LEN=1) :: NORM, UPLO, DIAG
       INTEGER :: N, KD, LDA, INFO
       INTEGER, DIMENSION(:) :: WORK2
       REAL :: RCOND
       REAL, DIMENSION(:) :: WORK
       REAL, DIMENSION(:,:) :: A

       SUBROUTINE TBCON_64(NORM, UPLO, DIAG, N, KD, A, LDA, RCOND,
              WORK, WORK2, INFO)

       CHARACTER(LEN=1) :: NORM, UPLO, DIAG
       INTEGER(8) :: N, KD, LDA, INFO
       INTEGER(8), DIMENSION(:) :: WORK2
       REAL :: RCOND
       REAL, DIMENSION(:) :: WORK
       REAL, DIMENSION(:,:) :: A




   C INTERFACE
       #include <sunperf.h>

       void stbcon(char norm, char uplo, char diag, int n, int kd,  float  *a,
                 int lda, float *rcond, int *info);

       void  stbcon_64(char norm, char uplo, char diag, long n, long kd, float
                 *a, long lda, float *rcond, long *info);



PURPOSE
       stbcon estimates the reciprocal of the condition number of a triangular
       band matrix A, in either the 1-norm or the infinity-norm.

       The norm of A is computed and an estimate is obtained for norm(inv(A)),
       then the reciprocal of the condition number is computed as
          RCOND = 1 / ( norm(A) * norm(inv(A)) ).


ARGUMENTS
       NORM (input)
                 Specifies whether the 1-norm condition number or  the  infin-
                 ity-norm condition number is required:
                 = '1' or 'O':  1-norm;
                 = 'I':         Infinity-norm.


       UPLO (input)
                 = 'U':  A is upper triangular;
                 = 'L':  A is lower triangular.


       DIAG (input)
                 = 'N':  A is non-unit triangular;
                 = 'U':  A is unit triangular.


       N (input) The order of the matrix A.  N >= 0.


       KD (input)
                 The  number of superdiagonals or subdiagonals of the triangu-
                 lar band matrix A.  KD >= 0.


       A (input) The upper or lower triangular band matrix A,  stored  in  the
                 first  kd+1 rows of the array. The j-th column of A is stored
                 in the j-th column of the array A as follows: if UPLO =  'U',
                 A(kd+1+i-j,j)  = A(i,j) for max(1,j-kd)<=i<=j; if UPLO = 'L',
                 A(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).  If DIAG = 'U',
                 the diagonal elements of A are not referenced and are assumed
                 to be 1.


       LDA (input)
                 The leading dimension of the array A.  LDA >= KD+1.


       RCOND (output)
                 The reciprocal of the condition number of the matrix A,  com-
                 puted as RCOND = 1/(norm(A) * norm(inv(A))).


       WORK (workspace)
                 dimension(3*N)

       WORK2 (workspace)
                 dimension(N)


       INFO (output)
                 = 0:  successful exit
                 < 0:  if INFO = -i, the i-th argument had an illegal value




                                  7 Nov 2015                        stbcon(3P)