Why does my code say too many input arguments?

function [ rts, info ] = cubicxxxx( C )
%UNTITLED Summary of this function goes here
%   Detailed explanation goes here
%C = [1 3 4 5]%example of vector
x0=1;
f=@ (x) C(1,1)*x.^3+C(1,2)*x.^2+C(1,3)*x+C(1,4);% cubic function
g=@ (x) C(1,1)*3*x.^2+C(1,2)*2*x+C(1,3);% derivative of cubic function
f(x0);
g(x0);
b=f(x0)-0;
while b<10^-6
   y =x0-((f(x0))/(g(x0)));
   x0=y;
   b=f(x0)-0;
end 
display(x0)
end

Answer 1

[James Tursa]

How are you calling this function? E.g.,

>> cubicxxxx(1:4)  % <-- one input vector
x0 =
     1
>> cubicxxxx(2:5)  % <-- one input vector
x0 =
     1
>> cubicxxxx(2:5,8)  % <-- two inputs
??? Error using ==> cubicxxxx
Too many input arguments.

>> cubicxxxx(1,2,3,4)  % <-- four inputs
??? Error using ==> cubicxxxx
Too many input arguments.

>> cubicxxxx([1,2,3,4])  % <-- one input vector
x0 =
     1