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)