This is my code for the function:
function x=newton(x0,func,grad,xTOL)%xo=initial guess
% func= function
% grad= derivative of function
% xTOL=tolerance
% solving f(x)=0 using the Newton's method with initial guess x0
%
xerror=xTOL*2;while xerror>xTOL x1 = x0 - feval(func,x0)/feval(grad,x0); xerror = abs(x1-x0); disp(x1); x0=x1; % x1= x_k, x0=x_{k-1}
endx= x1;end
I called it here:
x0=1;func=36*x^4-12*x^3+37*x^2-12*x+1;grad=144*x^3-36*x^2+74*x-12;xTOL=1*10^-6;newton(x0,func,grad,xTOL)
But it keeps coming up as x is undefined. Can someone help me. Is there code I am missing from the file where I call the function?
Best Answer