TESTING/LIN/sgtt02.f(3)    Library Functions Manual    TESTING/LIN/sgtt02.f(3)

NAME
       TESTING/LIN/sgtt02.f

SYNOPSIS
   Functions/Subroutines
       subroutine sgtt02 (trans, n, nrhs, dl, d, du, x, ldx, b, ldb, resid)
           SGTT02

Function/Subroutine Documentation
   subroutine sgtt02 (character trans, integer n, integer nrhs, real,
       dimension( * ) dl, real, dimension( * ) d, real, dimension( * ) du,
       real, dimension( ldx, * ) x, integer ldx, real, dimension( ldb, * ) b,
       integer ldb, real resid)
       SGTT02

       Purpose:


            SGTT02 computes the residual for the solution to a tridiagonal
            system of equations:
               RESID = norm(B - op(A)*X) / (norm(op(A)) * norm(X) * EPS),
            where EPS is the machine epsilon.
            The norm used is the 1-norm.

       Parameters
           TRANS

                     TRANS is CHARACTER
                     Specifies the form of the residual.
                     = 'N':  B - A    * X  (No transpose)
                     = 'T':  B - A**T * X  (Transpose)
                     = 'C':  B - A**H * X  (Conjugate transpose = Transpose)

           N

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

           NRHS

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

           DL

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

           D

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

           DU

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

           X

                     X is REAL array, dimension (LDX,NRHS)
                     The computed solution vectors X.

           LDX

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

           B

                     B is REAL array, dimension (LDB,NRHS)
                     On entry, the right hand side vectors for the system of
                     linear equations.
                     On exit, B is overwritten with the difference B - op(A)*X.

           LDB

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

           RESID

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

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Definition at line 123 of file sgtt02.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/sgtt02.f(3)