TESTING/LIN/sptt02.f(3)    Library Functions Manual    TESTING/LIN/sptt02.f(3)

NAME
       TESTING/LIN/sptt02.f

SYNOPSIS
   Functions/Subroutines
       subroutine sptt02 (n, nrhs, d, e, x, ldx, b, ldb, resid)
           SPTT02

Function/Subroutine Documentation
   subroutine sptt02 (integer n, integer nrhs, real, dimension( * ) d, real,
       dimension( * ) e, real, dimension( ldx, * ) x, integer ldx, real,
       dimension( ldb, * ) b, integer ldb, real resid)
       SPTT02

       Purpose:


           !>
           !> SPTT02 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
           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 REAL array, dimension (N-1)
           !>          The (n-1) subdiagonal elements of the tridiagonal matrix A.
           !>

           X

           !>          X is REAL 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 REAL 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 103 of file sptt02.f.

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

LAPACK                          Version 3.12.0         TESTING/LIN/sptt02.f(3)