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

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