Flow_Decomposition - 15.082 and 6.855J Flow Decomposition 1...

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1 15.082 and 6.855J Flow Decomposition
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2 begin Initialize while y do begin Select(s, y) Search(s, y) if a cycle C is found then do begin let = Capacity(C, y) Add Flow( , C) to cycle flows Subtract Flow( , C) from y. end if a path P is found then do begin let = Capacity(P, y) Add Flow( , P) to path flows Subtract Flow( , P) from y. end end
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3 The initial flow 1 2 4 5 3 6 2 3 4 7 3 4 4 8 5 9 2 -2 0 0 0 0 A supply node A demand node A balanced node The flow x
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4 Find a Path or Cycle 2 4 5 3 6 3 7 3 4 4 8 5 9 2 -2 0 0 Select a supply node 1 Carry out a depth first search until a cycle C or a path P is found Determine the capacity The capacity is 2.
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5 Update the decomposition 2 4 5 3 6 3 7 3 4 4 8 5 9 2 -2 0 0 Add the cycle flow to the decomposition 1 update the current flow cycle flows path flows 2 units around 1-2-4-5-3-1 2 5 6 7
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6 Find the next path or cycle 2 4 5 3 6 3 3 4 4 5 2 -2 0 0 Start at a supply node and find the next cycle or path 1 cycle flows path flows 2 units around 1-2-4-5-3-1 5 6 7
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7
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This note was uploaded on 05/05/2010 for the course EE 15.082 taught by Professor Orlin during the Spring '10 term at Visayas State University.

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Flow_Decomposition - 15.082 and 6.855J Flow Decomposition 1...

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