TESTING/LIN/cptt02.f(3)

NAME
TESTING/LIN/cptt02.f

SYNOPSIS

  Functions/Subroutines
subroutine cptt02 (uplo, n, nrhs, d, e, x, ldx, b, ldb, resid)
CPTT02

Function/Subroutine Documentation

  subroutine cptt02 (character uplo, integer n, integer nrhs, real, dimension( * ) d, complex, dimension( * ) e, complex, dimension( ldx, * ) x, integer ldx, complex, dimension( ldb, * ) b, integer ldb, real resid)

CPTT02

Purpose:

     CPTT02 computes the residual for the solution to a symmetric
     tridiagonal system of equations:
        RESID = norm(B - A*X) / (norm(A) * norm(X) * EPS),
     where EPS is the machine epsilon.

Parameters
    UPLO

              UPLO is CHARACTER*1
              Specifies whether the superdiagonal or the subdiagonal of the
              tridiagonal matrix A is stored.
              = 'U':  E is the superdiagonal of A
              = 'L':  E is the subdiagonal of A

    N

              N is INTEGER
              The order of the matrix A.

    NRHS

              NRHS is INTEGER
              The number of right hand sides, i.e., the number of columns
              of the matrices B and X.  NRHS >= 0.

    D

              D is REAL array, dimension (N)
              The n diagonal elements of the tridiagonal matrix A.

    E

              E is COMPLEX array, dimension (N-1)
              The (n-1) subdiagonal elements of the tridiagonal matrix A.

    X

              X is COMPLEX array, dimension (LDX,NRHS)
              The n by nrhs matrix of solution vectors X.

    LDX

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

    B

              B is COMPLEX array, dimension (LDB,NRHS)
              On entry, the n by nrhs matrix of right hand side vectors B.
              On exit, B is overwritten with the difference B - A*X.

    LDB

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

    RESID

              RESID is REAL
              norm(B - A*X) / (norm(A) * norm(X) * EPS)

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 114 of file cptt02.f.

Author

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