Error: Function definition not supported in this context. Create functions in code file.

function FixedPointIteration
%Fixed Point Iteration
Re=p*V*D/mu can be rewritten as Re= (1/mu)*P*V*D
D=.005; 
V=40; 
p=1.23; 
mu=1.79*10*-5; 
e=.0015;
 
function of Re;
Re=p*V*D/mu;%reynolds numbere quation 

g=@(x)(1/sqrt(x)+2*log(e/(3.7*D)+2.51/(Re*sqrt(x)))); 
%x = f(x)
syms 'x'
f=@(x)(-1./(2*log(e/(3.7*D)+2.51/(Re*sqrt(x))))).^2; 
x=.08; 
i=1;
 
while abs(g(x))> 1e-9 
    x=f(x); 
end
 
fprintf('Root found: %.10f\n'x) 
fprintf('Function value at root %E\n',g(x))

Answer 1

[Walter Roberson]

function of Re;

Wrong syntax for declaring a function.

Missing a % if it is intended to be a comment.

Re=p*V*D/mu can be rewritten as Re= (1/mu)*P*V*D

missing a % between the code and the comments

[Image Analyst]

function x = FixedPointIteration()
% Fixed Point Iteration
D=.005; 
V=40; 
p=1.23; 
mu=1.79*10*-5; 
e=.0015;
 
% Define the Re function:
% Re=p*V*D/mu can be rewritten as Re= (1/mu)*P*V*D if you'd rather.
Re=p*V*D/mu;    % Reynolds number equation 
% etc.