MatLab help with e^x


by sandbanana
Tags: matlab
sandbanana
sandbanana is offline
#1
Sep20-10, 07:36 PM
P: 9
1. The problem statement, all variables and given/known data

Plot e^x for -10 to 10 using a Taylor series about 0
find the error between the nth term and the actual value of e^-10 and e^10

plot sin(4*theta) using a 2 term expansion, a 4 term expansion and a 10 term expansion and constrast it with the plot of sin(4*theta)

3. The attempt at a solution

This is the first time I have ever opened MatLab and tried to do any sort of math programming. I suppose I need help in the logic of it or trying to trace what I am doing.

So far I have:

%This will compute the Taylor Series expansion of e^x for a user defined
%x value for the number of terms required by the user.  It will do this about the point
%a=0.  The result of the
%nth term will be compared to the computer generated value of e^x


x = input ('Enter a value for x:'); % user input of which value to use for x
i = input ('Enter the non-zero number of terms for this Taylor Series expansion:'); %user input of number of terms to use

% g_n: the nth term in Taylor Series

k=1;    % initialize k

g_n=x^(k-1)/factorial(k-1);   % begin with the first term

g=g_n;

while  i>k; % let index increase until number of desired terms reached
 
    k=k+1;  % increase index by 1
    g_n=x^(k-1)/factorial(k-1);
    g=g+g_n; %add the next term in the series   
end
    
disp(g)
I changed my code to what is listed above and it seemed to help entirely.
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xcvxcvvc
xcvxcvvc is offline
#2
Sep20-10, 09:19 PM
P: 393
http://www.mathworks.com/help/toolbo...ic/taylor.html


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