I need to create an anonymous function for the newton raphson method that finds the exact roots of (-1+5.5x-4x^2+0.5x^3) I do not even know where to begin.

I understand the derivative of my function must be present f' = 5.5-8x+1.5x^2 I also understand it follows a path of ; x_initial - f(x)/f'(x) there is a tolerance of 1e-4 beyond this, I do not know where to build this from scratch. I would appreciate if I could gain some knowledge from anyone willing to extend theirs. thanks in advance.

Answer 1

[misha riaz]

clear all

clc

syms x;

fun=input('Enter the funtion as a variable of X');

f=inline(fun);

z=diff(f(x));

f1=inline(z);

x0=input('Enter the initial value of interval');

x=x0;

for i=0:inf

y=x;

x=y-(f(x)/f1(x));

if x==y

break

end

end

fprintf('The total number of iteration are:');

i

x

[Walter Roberson]

we recommend against using inline(). See str2sym and matlabFunction