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Newton's Method Issues

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SB
SB 2012-11-19
Hi, I'm having a little trouble with my newton's method code.
One of my biggest issues is that I'm not able to create an output, rHist, which is a vector consisting of x0 and the outputs after every iteration of newton's method and my number of iterations is off by 1.
My code (posted below) also doesn't seem to work when the initial guess, x0 satisfies the stopping criterion.
% function [r,N,fRoot] = newtonRaphE7(fHan,dfHan,x0,fTol,iterMax)
k=1;
while k<=iterMax
x=x0-fHan(x0)/dfHan(x0)
if abs(x-x0)<fTol*abs(x)
return
x0=x;
r=x0;
k=k+1;
N=k;
fRoot=abs(fHan(r));
end
end

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回答（1 个）

Matt J
Matt J 2012-11-19
It should contain lines like this somewhere
rHist=zeros(1,iterMax+1);
....
rHist(k)=x;
My code (posted below) also doesn't seem to work when the initial guess, x0 satisfies the stopping criterion.
Because you're exiting without updating the outputs r,N, fRoot
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SB
SB 2012-11-19
Alright, how would I actually rewrite it, just move the statements after the if?
Matt J
Matt J 2012-11-19
Hint: MATLAB executes lines of code in order from top to bottom.

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