TESTING/LIN/cptt02.f(3)    Library Functions Manual    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
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0         TESTING/LIN/cptt02.f(3)