FORALL

• Parallelism must be explicit. Eg in F90 style:

  U(2:N-1, 2:N-1) =
  
  & 0.25 * (U(2:N-1, 1:N-2) + U(2:N-1, 3:N)
  & + U(1:N-2, 2:N-1) + U(3:N, 2:N-1))
  

• When array syntax unwieldy, can use FORALL statement:

  FORALL (I = 2:N-1, J = 2:N-1)
  
  & U(I, J) = 0.25 * (U(I, J-1) + U(I, J+1) +
  & U(I-1, J) + U(I+1, J))

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