Lab 01

M371-Alexiades
Lab 1: Taylor Series

Consider the problem of approximating ln(1.9) with ten digits of accuracy, using either of the following Taylor series:
(A) ln(1−x) = −∑ x^k/k , −1≤x<1
(B) ln[(1+x)/(1−x)] = 2 ∑ x^2k−1/(2k-1) , −1<x<1
( both sums run from k=1 to infinity )
Write out a few terms to get a sense what each series is like.
Note that ln(1.9) is approximately 0.641853886172

1. To get ln(1.9), what value of x do you have to use in series (A) ? in series (B) ?

2. Which series do you expect to be more efficient for computing ln(1.9) ? (...before you do the rest !)

3. Write a code that computes the sum of N terms in series (A), for specified input N .
Your code should print out (on one line):
• the value of the input N (number of terms),
• the value of the sum obtained from the series,
• the error.

4. Modify your code to do the same for series (B) [ comment out and modify ].

5. How many terms do you need to find ln(1.9) with 10 digits accuracy using series (A) ? series (B) ?

6. Which series is more efficient for computing ln(1.9) ? Briefly explain why.

Create a PLAIN TEXT file "Lab1.txt" containing:

	  Name: YOUR NAME
	  Lab : 1 	Date:
	  ==============================================================
	(a) answers to 1, 2 ;

	  ==============================================================
	(b) for each series: answer to 5 and what your code printed for that N
	  A: 
	  B:

	  ==============================================================
	(c) answer to 6 ;

	  ========================================================
	- your code (cleaned up!)

Submit the file Lab1.txt on Canvas (in plain text, no formating, no attachments please! )