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)