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MATH/CSCI-4800 Problem Set 5
发布时间:2023-03-01
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MATH/CSCI-4800
Due: Friday March 3, 2023
Problem Set 5
Submissions are due in the LMS by the end of the day. Also note that the use of syms in MATLAB is strictly forbidden.
1. (5 pts.) Exercise 1.1, problem 5
2. (5 pts.) Exercise 1.1, problem 6
3. (10 pts.) Computer Problem 1.1, problem 6
4. (5 pts.) Exercise 1.2, problem 10
5. (5 pts.) Exercise 1.2, problem 16
6. (20 pts.) Consider the nonlinear equation f (x) = x4 − 5x2 + 4 = 0.
(a) Verify that x = 1 is a solution.
(b) Convert f (x) = 0 to a fixed point equation g(x) = x where this is not the fixed point iteration implied by Newton’s method, and verify that x = 1 is a fixed point of g(x) = x.
(c) Convert f (x) = 0 to the fixed point iteration implied by Newton’s method and again verify that x = 1 is a fixed point.
(d) Write MATLAB code to iterate on your fixed point iteration as well as the fixed point iteration implied by Newton. Compare these results based on x0 = 1.1. How fast did Newton converge? How fast did your iteration from part b converge (or did it at all)? What does the theory of fixed points tell you about these convergence results?