TESTING/LIN/zgtt02.f(3)    Library Functions Manual    TESTING/LIN/zgtt02.f(3)

NAME
       TESTING/LIN/zgtt02.f

SYNOPSIS
   Functions/Subroutines
       subroutine zgtt02 (trans, n, nrhs, dl, d, du, x, ldx, b, ldb, resid)
           ZGTT02

Function/Subroutine Documentation
   subroutine zgtt02 (character trans, integer n, integer nrhs, complex*16,
       dimension( * ) dl, complex*16, dimension( * ) d, complex*16, dimension(
       * ) du, complex*16, dimension( ldx, * ) x, integer ldx, complex*16,
       dimension( ldb, * ) b, integer ldb, double precision resid)
       ZGTT02

       Purpose:


           !>
           !> ZGTT02 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.
           !>

       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)
           !>

           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 COMPLEX*16 array, dimension (N-1)
           !>          The (n-1) sub-diagonal elements of A.
           !>

           D

           !>          D is COMPLEX*16 array, dimension (N)
           !>          The diagonal elements of A.
           !>

           DU

           !>          DU is COMPLEX*16 array, dimension (N-1)
           !>          The (n-1) super-diagonal elements of A.
           !>

           X

           !>          X is COMPLEX*16 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 COMPLEX*16 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 DOUBLE PRECISION
           !>          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 122 of file zgtt02.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/zgtt02.f(3)