CowboyRobot writes: "Clay Breshears at Dr. Dobb's has a fun formula for optimizing the drive between multiple cities. "Think of a map as an instance of a graph, the cities are the nodes and the roads between cities are the edges. The length of the road is the weight of the corresponding edge. The All-Pairs Shortest Path problem takes a graph of n nodes represented by an n x n weight matrix, W. The result is an n x n matrix, D (for distance), where the D[i][j] entry holds the minimum weight of the path from node i to node j. Entries in the W matrix can be zero, positive (if a direct edge lies between the two nodes), or the infinity value where there is no direct edge between the nodes.""
Economists can certainly disappoint you. One said that the economy would
turn up by the last quarter. Well, I'm down to mine and it hasn't.
-- Robert Orben