How do I set up an array of functions to use as an input

The provided example says to use

function [ G ] = ex( X )
G = [(-0.1*X(1)^3 + 0.1*X(2) + 0.5) (0.1*X(1) + 0.1*X(2)^3 +0.1)]

as the input for function x = FixedptSys( G, X0, tol)

which gives me an error no matter how I set up the function array

in FixedptSys I'm trying to do feval(G, X0)'; where X0(1) and X0(2) are given and supposedly I should get an array back

I've gone as far as doing :

function  G  = ex(    X) 

F(1).fun = inline(['-0.1*x^3 + 0.1*y + 0.5']);
F(2).fun = inline(['0.1*x + 0.1*y^3 +0.1']);
G(1) = feval(F(1).fun,X(1),X(2));
G(2) = feval(F(2).fun,X(1),X(2));
end

and saving it as a function but every time I try to input it FixedptSys( G, X0, tol)

x = FixedptSys( G, X0, tol) why I try to call it with G , it runs it and says not enough input

Error in G (line 2) display(X)

Any similar implementation method would work though I'd love to find out how the example has it

thanks in advance

Also here is Fixpoint

function  x  = FixedptSys( G, X0, tol)
% use fixed=point iteration to solve G(x) = x
% assuming G has a soln (meets condition 1 and 2 )
% if G is a system fo equations it shoudl accept a vector

%%first iteration of x and error
xnew = feval(G, X0)';
err = norm(xnew - X0); 
% alterinatively err(1) and susbequtenly err(i) maybe used to save
% iterations

%error check
while abs(err) <= tol

%%finding the next x and err
xnew = feval(G, X0)'; 
err = norm(xnew - X0); 
X0 = xnew;

end
%%Final solution
x = xnew; 

% given the theorem 2.3 numerical computations, this is gurantted to give an answer 
% if intial contions are met so no need to code the failure case

end

Answer 1

[Image Analyst]

You're getting the name of the returned variable, the name of the function, and the name of the m-file all mixed up. The name of that function is ex(), NOT G(). G is a 2 element array that is the output of ex(). So your m-file should also be ex.m, not G.m and (I think) you should pass @ex, which is a handle to the function, into FixedptSys() not G, which is simply a 2 element array.

[Ali1373]

O my god yes that @ was magic! thankyou!

Also i have actual file saved as G so that solves that