TESTING/LIN/cgtt01.f(3)

NAME
TESTING/LIN/cgtt01.f

SYNOPSIS

  Functions/Subroutines
subroutine cgtt01 (n, dl, d, du, dlf, df, duf, du2, ipiv, work, ldwork, rwork, resid)
CGTT01

Function/Subroutine Documentation

  subroutine cgtt01 (integer n, complex, dimension( * ) dl, complex, dimension( * ) d, complex, dimension( * ) du, complex, dimension( * ) dlf, complex, dimension( * ) df, complex, dimension( * ) duf, complex, dimension( * ) du2, integer, dimension( * ) ipiv, complex, dimension( ldwork, * ) work, integer ldwork, real, dimension( * ) rwork, real resid)

CGTT01

Purpose:

     CGTT01 reconstructs a tridiagonal matrix A from its LU factorization
     and computes the residual
        norm(L*U - A) / ( norm(A) * EPS ),
     where EPS is the machine epsilon.

Parameters
    N

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

    DL

              DL is COMPLEX array, dimension (N-1)
              The (n-1) sub-diagonal elements of A.

    D

              D is COMPLEX array, dimension (N)
              The diagonal elements of A.

    DU

              DU is COMPLEX array, dimension (N-1)
              The (n-1) super-diagonal elements of A.

    DLF

              DLF is COMPLEX array, dimension (N-1)
              The (n-1) multipliers that define the matrix L from the
              LU factorization of A.

    DF

              DF is COMPLEX array, dimension (N)
              The n diagonal elements of the upper triangular matrix U from
              the LU factorization of A.

    DUF

              DUF is COMPLEX array, dimension (N-1)
              The (n-1) elements of the first super-diagonal of U.

    DU2

              DU2 is COMPLEX array, dimension (N-2)
              The (n-2) elements of the second super-diagonal of U.

    IPIV

              IPIV is INTEGER array, dimension (N)
              The pivot indices; for 1 <= i <= n, row i of the matrix was
              interchanged with row IPIV(i).  IPIV(i) will always be either
              i or i+1; IPIV(i) = i indicates a row interchange was not
              required.

    WORK

              WORK is COMPLEX array, dimension (LDWORK,N)

    LDWORK

              LDWORK is INTEGER
              The leading dimension of the array WORK.  LDWORK >= max(1,N).

    RWORK

              RWORK is REAL array, dimension (N)

    RESID

              RESID is REAL
              The scaled residual:  norm(L*U - A) / (norm(A) * EPS)

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 132 of file cgtt01.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.