Communication in LU example

• The statement

  COL(K:N) = A(K:N, K)
  

broadcasts Kth column of A.

• The statement

  A(K, K+1:N) = A(K, K+1:N) / COL(K)
  

needs no communication (reason for using COL(K) rather than A(K, K)).

• The statement

  ROW(K+1:N) = A(K, K+1:N)
  

broadcasts Kth row of A.

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