Calling a function for an array of inputs

So I'm trying to complete this code that utilizes the Newton Raphson method to solve the Rachford-Rice equation. My Newton Raphson function is:

function [x, i]=NewtonRaphson(func, dfunc, v_0, tolerance)
%a function to find the roots of a function, f, using the NewtonRaphson
%method. Outputs the roots and iterations

clear;clc;

i=1; %first iteration is initialized

x(i)=v_0; %the value of the function input at the first index is declared

while abs(func(x(i)))>tolerance %a while loop to determine if the the function evaluated at the iterated input is within tolerance
    fprintf('During iteration %d, a value of x=%.2f yielded f=%.2E\n',i,x(i),func(x(i))) %prints the iterations, root, and function evaluated at that root

      x(i+1)=x(i)-func(x(i))./df(x(i)); %Newton Raphson method
      i=i+1; %iteration increased by 1 at the end of the cycle

end

   fprintf('During iteration %d, a value of x=%.2f yielded f=%.2E\n Convergence is within tolerance.\n',i,x(i),f(x(i))) %prints the final value of the function and root and the last iteration

end

I've also created a script file to feed inputs to the function:

F=[20; 30; 50];
K=[3.7; 1.4; 0.6];

tol=0.0001;

z=zeros(1, length(K));

v_initial=0.6;

for n=(1:length(F))
    z(n)=F(n)/100;
    f=@(v)((K(n)-1).*z(n))/(1+(K(n)-1)*v);
    df=@(v) z(n)*LOG(v);

      NewtonRaphson(f, df, v_initial, tol)
  end

Whenever I try to run this, I get an error stating that I have too many input arguments. Originally I called the function outside of the for loop, got that error, put the function I defined and the call to NewtonRapshon within the for loop and still receive that error. What am I doing wrong? I believe my NewtonRaphson function is alright, but something I'm doing in this script is causing an error and I have a hunch it's the array of values I'm feeling into it with the for loop.

[Ankitha Kollegal Arjun]

Please check if you have any other function named 'NewtonRaphson'. You can do so by using the following command:

 whcih -all NewtonRaphson

[Walter Roberson]

You need to get rid of the

clear;clc;

inside your function.

[Vaidyanathan Thiagarajan]

You have the following issues with your code :

1. Get rid of 'clear' and 'clc' commands from within your 'NewtonRaphson' function

2. Line 11 in your driver code should be the following :

df=@(v) z(n)*log(v);

instead of

df=@(v) z(n)*LOG(v);

Note: MATLAB is case-sensitive and there is no function called LOG in MATLAB.

3. Line 9 in 'NewtronRaphson' function should be the following :

x(i+1)=x(i)-func(x(i))./dfunc(x(i)); %Newton Raphson method

and not

x(i+1)=x(i)-func(x(i))./df(x(i)); %Newton Raphson method

Making the above changes will get rid of all your compiler errors.

Hope it helps,

Best Regards,

Vaidyanathan