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States and Searching in VS .NET Generator PDF 417 in VS .NET States and Searching




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3. States and Searching using barcode generation for .net vs 2010 control to generate, create denso qr bar code image in .net vs 2010 applications. rfid Dynamic progra QR Code ISO/IEC18004 for .NET mming can be used to construct heuristics for A and branch-and-bound searches. One way to build a heuristic function is to simplify the problem (e.

g., by leaving out some details) until the simpli ed problem has a small enough state space. Dynamic programming can be used to nd the optimal path length to a goal in the simpli ed problem.

This information can then be used as a heuristic for the original problem.. Review The following Denso QR Bar Code for .NET are the main points you should have learned from this chapter:. Many problem s can be abstracted as the problem of nding paths in graphs. Breadth- rst and depth- rst searches can nd paths in graphs without any extra knowledge beyond the graph. A search can use a heuristic function that estimates the cost from a node to a goal.

If this estimate underestimates the actual cost, A is guaranteed to nd a least-cost path rst. Iterative deepening and depth- rst branch-and-bound searches can be used to nd least-cost paths with less memory than methods such as A , which store multiple paths. When graphs are small, dynamic programming can be used to record the actual cost of a least-cost path from each node to the goal, which can be used to nd the next arc in an optimal path.

. References and Further Reading There is a lot of information on search techniques in the literature of operations research, computer science, and AI. Search was seen early on as one of the foundations of AI. The AI literature emphasizes heuristic search.

Basic search algorithms are discussed in Nilsson [1971]. For a detailed analysis of heuristic search see Pearl [1984]. The A algorithm was developed by Hart, Nilsson, and Raphael [1968].

Depth- rst iterative deepening is described in Korf [1985]. Branch-and-bound search was developed in the operations research community and is described in Lawler and Wood [1966]. Dynamic programming is a general algorithm that will be used as a dual to search algorithms in other parts of the book.

The speci c algorithm presented here was invented by Dijkstra [1959]. See Cormen, Leiserson, Rivest, and Stein [2001] for more details on the general class of dynamic programming algorithms. The idea of using dynamic programming as a source of heuristics for A search was proposed by Culberson and Schaeffer [1998] and further developed by Felner, Korf, and Hanan [2004].

Minsky [1961] discussed islands and problem reduction.. 3.10. Exercises Figure 3.13: A grid-searching problem Exercises Exercise 3.1 C omment on the following quote: One of the main goals of AI should be to build general heuristics that can be used for any graph-searching problem. Exercise 3.

2 Which of the path- nding search procedures are fair in the sense that any element on the frontier will eventually be chosen Consider this for question nite graphs without loops, nite graphs with loops, and in nite graphs (with nite branching factors). Exercise 3.3 Consider the problem of nding a path in the grid shown in Figure 3.

13 from the position s to the position g. A piece can move on the grid horizontally and vertically, one square at a time. No step may be made into a forbidden shaded area.

. (a) On the gri qrcode for .NET d shown in Figure 3.13, number the nodes expanded (in order) for a depth- rst search from s to g, given that the order of the operators is up, left, right, then down.

Assume there is a cycle check. (b) For the same grid, number the nodes expanded, in order, for a best- rst search from s to g. Manhattan distance should be used as the evaluation function.

The Manhattan distance between two points is the distance in the x-direction plus the distance in the y-direction. It corresponds to the distance traveled along city streets arranged in a grid. Assume multiple-path pruning.

What is the rst path found (c) On the same grid, number the nodes expanded, in order, for a heuristic depth- rst search from s to g, given Manhattan distance as the evaluation function. Assume a cycle check. What is the path found .

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