How to define a function for ode in Scilab?

Question

It shows that function f is not defined when executing u1 = ode

How can I define f correctly?

function xp,f(r,x,E)

    e = 3.795;
    m = 0.5111 * 10 ^ 6;
    h = 1973;
    xp(1) = x(2);
    xp(2) = (((2*m) / (h*h)) * (-((e*e/r) - E))) * x(1);

endfunction

E1 = input ("Enter the 1st guess for energy :");

E2 = input ("Enter the 2nd guess for energy :");

rmin = 0.01;

rmax = 20;

h = 0.01;

for i = 1:100

    r = rmin : h : rmax;
    u1 = ode([0.01 ; 1], rmin, r, list(f,E1));
    u2 = ode([0.01 ; 1], rmin, r, list(f,E2));
    
    E3 = (E1 + E2)/2;
    
    u3 = ode([0.01 ; 1], rmin, r, list(f,E3));

Answer 1

The definition of the function has to be fixed like this : output argument = f(input arguments)

function xp = f(r,x,E)

    e = 3.795;
    m = 0.5111 * 10 ^ 6;
    h = 1973;
    xp(1) = x(2);
    xp(2) = (((2*m) / (h*h)) * (-((e*e/r) - E))) * x(1);

endfunction

and add an end to close your loop at the end. BW, the endfunction shows and the argument list for ode() show that you are using Scilab, not Octave (title and tags have been edited accordingly).