Not enough input arguments. and too many input arguments. I'm confused about why this happened? thank you so much

function y=CosxMinusx(x)
    y=cos(x)-x;
end

function [ root ] = FindRoot ( a, b, N, tol, fcnHandle )
   for n=1:N
        root=a+(b-a)/2;
        if fcnHandle(a)*fcnHandle(root)>0
            a=root;
        else
            b=root;
        end
        [n a b root fcnHandle(root)]
        if (b-a)/2<tol
            break
        end  
    end

>> CosxMinusx
Error using CosxMinusx (line 2)
Not enough input arguments.

>> FindRoot
Error using FindRoot (line 10)
Not enough input arguments.

>> FindRoot ( -10, 10, 100, 0.01, @CosxMinusx )
Error using FindRoot
Too many input arguments.

[Mohammad Abouali]

not enough input to answer your question either.

Where is the code for CosxMinusx

[kitty jiang]

Thank you, even though it says not enough input argument, but I could get a number for CosxMinusx(1) in the command window, however, new problem poped up. Why does it say too many input argument. Thank you=)

[Image Analyst]

Hopefully those are in two different m-files because you are not allowed to mix the way you "finish" functions. You either have to omit "end"s for all functions or have "end"s for all functions but you can't mix them.

Answer 1

[Matt J]

Because you didn't pass any input arguments to CosxMinusx when you invoked it.

How is it supposed to evaluate

    y=cos(x)-x;

when you didn't supply any input x value to the function?

[kitty jiang]

Thank you, even though it says not enough input argument, but I could get a number for CosxMinusx(1) in the command window, however, new problem poped up. Why does it say too many input argument. Thank you=)

[Matt J]

For me, CosxMinusx(1) returns

 ans =

   -0.4597