Do-loops and Forall Statements

Take care, FORALL semantics are different to DO-loop semantics,

    DO i = 2, n-1
     a(i) = a(i-1) + a(i) + a(i+1)
    END DO

is different to,

    FORALL (i=2:n-1) &
     a(i) = a(i-1) + a(i) + a(i+1)

which is the same as,

     a(2:n-1) = a(1:n-2) + a(2:n-1) + a(3:n)

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