chw2 - and the relative error (abolute error divided by the...

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Math 128a, fall 2011, Chorin, computer homework 2 1. Write a computer program that truncates a number x after n digits, in a manner consistent with floating point representation, e.g., when n = 2, convert 1234 . 56 into 1200 . 00 and . 01234 into . 012. 2. Use the program from 1. to evaluate e x from its Taylor series around the origin, with n digit storage (i.e., truncate the outcome of each calculation after n digits), for x = . 1 , - 1 ., - 5 . with n = 2 , 3 , 4 , 5 , 6 for each value of x . In each case report the absolute error (the truth minus the result)
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Unformatted text preview: and the relative error (abolute error divided by the truth). Do not let the summation run for ever- stop it when adding more terms makes no difference. Observe the effects of round-off error. Warning: Calculating things like x n and n ! for large n is costly, and in many computing systems, liable to problems with overflow. If the term you add at the n-th step is a n , calculate a n +1 by multiplying a n by a suitable factor. 1...
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This note was uploaded on 01/21/2012 for the course MATH 128A taught by Professor Rieffel during the Fall '08 term at Berkeley.

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