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

NAME
       SRC/cgecon.f

SYNOPSIS
   Functions/Subroutines
       subroutine cgecon (norm, n, a, lda, anorm, rcond, work, rwork, info)
           CGECON

Function/Subroutine Documentation
   subroutine cgecon (character norm, integer n, complex, dimension( lda, * )
       a, integer lda, real anorm, real rcond, complex, dimension( * ) work,
       real, dimension( * ) rwork, integer info)
       CGECON

       Purpose:


           !>
           !> CGECON estimates the reciprocal of the condition number of a general
           !> complex matrix A, in either the 1-norm or the infinity-norm, using
           !> the LU factorization computed by CGETRF.
           !>
           !> An estimate is obtained for norm(inv(A)), and 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.
           !>

           N

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

           A

           !>          A is COMPLEX array, dimension (LDA,N)
           !>          The factors L and U from the factorization A = P*L*U
           !>          as computed by CGETRF.
           !>

           LDA

           !>          LDA is INTEGER
           !>          The leading dimension of the array A.  LDA >= max(1,N).
           !>

           ANORM

           !>          ANORM is REAL
           !>          If NORM = '1' or 'O', the 1-norm of the original matrix A.
           !>          If NORM = 'I', the infinity-norm of the original matrix A.
           !>

           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 COMPLEX array, dimension (2*N)
           !>

           RWORK

           !>          RWORK is REAL array, dimension (2*N)
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0:  successful exit
           !>          < 0:  if INFO = -i, the i-th argument had an illegal value.
           !>                NaNs are illegal values for ANORM, and they propagate to
           !>                the output parameter RCOND.
           !>                Infinity is illegal for ANORM, and it propagates to the output
           !>                parameter RCOND as 0.
           !>          = 1:  if RCOND = NaN, or
           !>                   RCOND = Inf, or
           !>                   the computed norm of the inverse of A is 0.
           !>                In the latter, RCOND = 0 is returned.
           !>

       Author
           Univ. of Tennessee


           Univ. of California Berkeley


           Univ. of Colorado Denver


           NAG Ltd.

       Definition at line 130 of file cgecon.f.

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

LAPACK                          Version 3.12.0                 SRC/cgecon.f(3)