Minimum Spanning tree Prim’s algorithm 1.Select any vertex 2.Select the shortest edge connected to that vertex 3.Select the shortest edge which connects.

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Presentation transcript:

Minimum Spanning tree Prim’s algorithm 1.Select any vertex 2.Select the shortest edge connected to that vertex 3.Select the shortest edge which connects a previously chosen vertex to a new vertex 4.Repeat step 3 until all vertices have been connected

A cable company want to connect five villages to their network which currently extends to the market town of Avenford. What is the minimum length of cable needed? Avenford Fingley Brinleigh Cornwell Donster Edan Example

ABCDEF A B C D E F Prim’s algorithm in tabular form First put the information from the network into a distance matrix

ABCDEF A B C D E F Start at vertex A. Label column A “1”. Delete row A Select the smallest entry in column A (AB, length 3) 1 Avenford Brinleigh 3

ABCDEF A B C D E F Label column B “2” Delete row B Select the smallest uncovered entry in either column A or column B (AE, length 4) 2 Avenford Brinleigh 3 Edan 4

ABCDEF A B C D E F Label column E “3” Delete row E Select the smallest uncovered entry in either column A, B or E (ED, length 2) 3 Avenford Brinleigh 3 Edan 4 Donster 2

ABCDEF A B C D E F Label column D “4” Delete row D Select the smallest uncovered entry in either column A, B, D or E (DC, length 4) 4 Avenford Brinleigh 3 Edan 4 Donster 2 Cornwell 4

ABCDEF A B C D E F Label column C “5” Delete row C Select the smallest uncovered entry in either column A, B, D, E or C (EF, length 5) 45 Avenford Brinleigh 3 Edan 4 Donster 2 Cornwell 4 Fingley 5

ABCDEF A B C D E F FINALLY Label column F “6” Delete row F 6 Avenford Brinleigh 3 Edan 4 Donster 2 Cornwell 4 Fingley 5

ABCDEF A B C D E F FINALLY Label column F “6” Delete row F 6 The spanning tree is shown in the diagram Length = 18Km Avenford Brinleigh 3 Edan 4 Donster 2 Cornwell 4 Fingley 5