MATLAB: My code says too many output arguments

MATLAB

function newton
x0 = input('Enter the initial guess value, x: ');
tolerance = input('Enter the tolerance value, tol: ');
max_i = input('Enter the maximum no. of iteration, max_i: ');
r = input('Enter the value of relative roughness, e/D: ');
RN = input('Enter the Reynolds number, RN: ');
f = input('Enter the Friction factor, f: ');
c = colebrook/colebrook_deriv;
x=x0;
for i=1:max_i
y = x;
x = y – (c);
if abs(x-y)<= tolerance
disp(['root = ', num2str(x)])
break
end
end
fprintf('The number of iterations: %d\n', i)
My functions I'm calling are
function colebrook
%%Formula for C(fd)
CFd =(1/sqrt(f)) + 2*log10(r/(3.7)+ 2.51/(RN*sqrt(f)));
end
function colebrook_deriv
CFd1 = 1/(2*f^(3/2)) + 2.51/RN*f^(3/2)log(10)(r/3.7) + 2.51/(RN*f^(1/2));
end
Please do help with answers

Best Answer

Give your functions outputs:
newton
function newton
x0 = input('Enter the initial guess value, x: ');
tolerance = input('Enter the tolerance value, tol: ');
max_i = input('Enter the maximum no. of iteration, max_i: ');
r = input('Enter the value of relative roughness, e/D: ');
RN = input('Enter the Reynolds number, RN: ');
f = input('Enter the Friction factor, f: ');
c = colebrook/colebrook_deriv;
x=x0;
for i=1:max_i
    y = x;
    x = y - (c);
    if abs(x-y)<= tolerance
        disp(['root = ', num2str(x)])
        break
    end
end
fprintf('The number of iterations: %d\n', i)
    function CFd = colebrook
        %%Formula for C(fd)
        CFd =(1/sqrt(f)) + 2*log10(r/(3.7)+ 2.51/(RN*sqrt(f)));
    end
    function CFd1 = colebrook_deriv
        CFd1 = 1/(2*f^(3/2)) + 2.51/RN*f^(3/2)*log(10)*(r/3.7) + 2.51/(RN*f^(1/2));
    end
end
Also check the function for colebrook_deriv i had to make a change (missing '*' i guess) tha you should correct if needed. Problems here:
CFd1 = 1/(2*f^(3/2)) + 2.51/RN*f^(3/2)log(10)(r/3.7) + 2.51/(RN*f^(1/2));
%                                     ^      ^
%                                     |      |
%                                      ----------- Check here
Also i added the final end, because i suspect that you wanted to have nested functions.
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