SRC/stbcon.f(3)            Library Functions Manual            SRC/stbcon.f(3)

NAME
       SRC/stbcon.f

SYNOPSIS
   Functions/Subroutines
       subroutine stbcon (norm, uplo, diag, n, kd, ab, ldab, rcond, work,
           iwork, info)
           STBCON

Function/Subroutine Documentation
   subroutine stbcon (character norm, character uplo, character diag, integer
       n, integer kd, real, dimension( ldab, * ) ab, integer ldab, real rcond,
       real, dimension( * ) work, integer, dimension( * ) iwork, integer info)
       STBCON

       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)) ).
           !>

       Parameters
           NORM

           !>          NORM is CHARACTER*1
           !>          Specifies whether the 1-norm condition number or the
           !>          infinity-norm condition number is required:
           !>          = '1' or 'O':  1-norm;
           !>          = 'I':         Infinity-norm.
           !>

           UPLO

           !>          UPLO is CHARACTER*1
           !>          = 'U':  A is upper triangular;
           !>          = 'L':  A is lower triangular.
           !>

           DIAG

           !>          DIAG is CHARACTER*1
           !>          = 'N':  A is non-unit triangular;
           !>          = 'U':  A is unit triangular.
           !>

           N

           !>          N is INTEGER
           !>          The order of the matrix A.  N >= 0.
           !>

           KD

           !>          KD is INTEGER
           !>          The number of superdiagonals or subdiagonals of the
           !>          triangular band matrix A.  KD >= 0.
           !>

           AB

           !>          AB is REAL array, dimension (LDAB,N)
           !>          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 AB as follows:
           !>          if UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j;
           !>          if UPLO = 'L', AB(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.
           !>

           LDAB

           !>          LDAB is INTEGER
           !>          The leading dimension of the array AB.  LDAB >= KD+1.
           !>

           RCOND

           !>          RCOND is REAL
           !>          The reciprocal of the condition number of the matrix A,
           !>          computed as RCOND = 1/(norm(A) * norm(inv(A))).
           !>

           WORK

           !>          WORK is REAL array, dimension (3*N)
           !>

           IWORK

           !>          IWORK is INTEGER array, dimension (N)
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 141 of file stbcon.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/stbcon.f(3)