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Instructions: Choose the best answer for each question.
1. What is the chessboard distance between the points (2, 3) and (5, 1) on a 2-dimensional integer lattice?
a) 2
Incorrect
b) 3
Correct
c) 4
Incorrect
d) 5
Incorrect
2. In which of the following electrical engineering applications is chessboard distance NOT directly relevant?
a) Detecting edges in an image.
Incorrect
b) Analyzing the frequency spectrum of a signal.
Correct
c) Finding the shortest path for a robot in a grid-based environment.
Incorrect
d) Identifying potential faults in a power grid.
Incorrect
3. What is the key difference between the chessboard distance and the Euclidean distance?
a) Chessboard distance is always greater than Euclidean distance.
Incorrect
b) Chessboard distance considers only the maximum difference between coordinates, while Euclidean distance considers the sum of squared differences.
Correct
c) Chessboard distance is used for continuous spaces, while Euclidean distance is used for discrete spaces.
Incorrect
d) Chessboard distance is more computationally intensive than Euclidean distance.
Incorrect
4. What is the chessboard distance between the points (1, 2, 3) and (4, 1, 5) in a 3-dimensional integer lattice?
a) 3
Correct
b) 4
Incorrect
c) 5
Incorrect
d) 6
Incorrect
5. Which of the following best describes the significance of the chessboard distance in electrical engineering?
a) It provides a complex measure of distance between points in multi-dimensional spaces.
Incorrect
b) It offers a simple and efficient way to measure distance between discrete points in various applications.
Correct
c) It is essential for understanding continuous signals and their transformations.
Incorrect
d) It is primarily used for theoretical analysis and has limited practical applications.
Incorrect
Task: Imagine a simple 2D grid representing a robotic arm's workspace. The arm's current position is (2, 3), and it needs to reach a target point at (5, 1).
1. Calculate the chessboard distance between the current position and the target position.
2. Using the chessboard distance, outline a possible shortest path the robot arm could take to reach the target.
3. Explain how this path would be different from the shortest path calculated using Euclidean distance.
**1. Chessboard distance:** * The difference in x-coordinates is |2 - 5| = 3 * The difference in y-coordinates is |3 - 1| = 2 * The maximum difference is 3. Therefore, the chessboard distance is 3. **2. Shortest path using chessboard distance:** * The robot arm can move three steps horizontally to the right (from (2, 3) to (5, 3)) and then two steps vertically downwards (from (5, 3) to (5, 1)). **3. Difference from Euclidean distance:** * The Euclidean distance between the points would be calculated using the formula: √((5-2)² + (1-3)²) = √(9 + 4) = √13 ≈ 3.61. * The shortest path using Euclidean distance would involve diagonal movements, resulting in a more curved path. The chessboard distance focuses on moving along grid lines, leading to a "blocky" path that may not be the most visually direct but is optimal in terms of the number of steps required.
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