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Provide a function rfNewtonR that implements the Newton-Raphson metnod.
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Provide a function rfNewtonR that implements the Newton-Raphson metnod.

Codes should include fun(x), x0 = initial guess for the root, TolX = desired relative error for the root given by |x_i+1 - x_i| / |x_i|, itmax = maximum number of iteratinos. I don't know what I did wrong but I always get the wrong x value.

function x = rfNewtonR(fun,x,TolX,itmax)
[f, fp] = fun(x);
% Find the root of f(x) = 0 using the Newton-Raphson method.
x0 = 0;
iter = 0;
TolX = 1e-6;
itmax = 20;
while (iter<itmax) && (abs(fun(x))>TolX)
x = x0-(f(x0)/fp(x0));
iter = iter +1;

% Start the iteration.
if iter == itmax
msgID = 'rfNewtonR: IterationLimitExceeded'


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