Taylor series for e^x with loop
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How would I solve this problem and only compute the first 12 interations?
6 个评论
Steven Lord
2022-7-18
This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific question about where you're having difficulty and we may be able to provide some guidance.
If you aren't sure where to start because you're not familiar with how to write MATLAB code, I suggest you start with the free MATLAB Onramp tutorial to quickly learn the essentials of MATLAB.
If you aren't sure where to start because you're not familiar with the mathematics you'll need to solve the problem, I recommend asking your professor and/or teaching assistant for help.
Allison
2022-7-18
编辑：John D'Errico
2022-7-18
John D'Errico
2022-7-18
Lacking any code shown before, there was no evidence that you had done anything, on clear homework. But now you have shown at least some effort.
Note that I edited your code to make it readable. You might want to learn to do that, using the buttons on top of the edit window in Answers.
My questions would be:
1. What do you think this
index=1:n;
line does?
Does it serve any purpose, since index is never used?
2. Is n ever changing? How about the variable i? So will your loop ever terminate?
3. Since you will be generating a loop that explicitly goes for ALWAYS exactly 12 iterations, would a for loop be a better choice than a while loop?
4. What does this line do, since that is not the general series for exp(x)?
ex= 1+x+((x)^i/factorial(i));
(Yes, it is sort of related, in the sense that the first two terms are correct, and the third term there you have written is a form for the general term in the sum. But that does not make it the correct sum.)
5. What are you doing with the variable ex? Did not the series involve a sum, in this case of 12 total terms?
6. Is the fprintf syntax correct? Did you read the help for fprintf? Why not? Look at the examples shown in the docs for fprintf.
Why not take another shot at it, based on the comments I've made here.
Allison
2022-7-19
Works, I guess.
%x = input('Enter value of x');
x = 2;
value=0;
for i=0:12
value = value + x^i/factorial(i);
end
fprintf('Computed Value: %f', value)
value
exp(2)
回答（1 个）
%% This is more efficient
x = 2;
v = 1;
n = 1;
d = 1;
for i = 1:20
n = n*x;
d = d*i;
v = v + n/d;
end
fprintf('Computed Value: %f', v)
1 个评论
x = 2;
v = 1;
s = 1;
for i = 1:20
s = s * x/i;
v = v + s;
end
fprintf('Computed Value: %f', v)
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