Newton's Method for finding zeros

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Lucas Brockman
Lucas Brockman 2019-2-6
回答： Geoff Hayes 2019-2-7
I am trying to divide the function f(x0) by its derivitive df(x0), but Matlab keeps giving me errors about dividing by df(x0). My code is the following:
clear;
syms x f(x) f df(x) df
f = @(x) x.^2 - 3;
df = diff(f,x);
x0 = 1;
N = 6;
epsilon = 0.000001;
for t = 1:N
j = x0;
x0 = x0 - f(x0)/df(x0);
end
disp(x0)

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回答（1 个）

Geoff Hayes
Geoff Hayes 2019-2-7
Lucas - what errors are you observing? Please copy and paste the full error message to your question. Do you need to use the Symbolic Toolbox? Can't you define df as just
df = @(x)2*x;
Note how your code isn't using epsilon. How are you supposed to be using this value?

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