correct the following code

function sol = sample2
    global B s;
    B = 4;
    s = 0;

    % Define your global variables
    global delta eta lamda N M Pr Nb Nt Ec Sc gamma epsilon;
    % Assign appropriate values to your global variables
    delta = 1;  % Replace with actual values
    eta = 2;    % Replace with actual values
    lamda = 3;  % Replace with actual values
    % ... (define other global variables similarly)

    solinit1 = bvpinit(linspace(0, B, 100), @sample1init);
    sol = bvp5c(@sample1ode, @sample1bc, solinit1);

    figure(1);
    plot(sol.x, sol.y(1, :), 'g.-');
    hold on;
    plot(sol.x, sol.y(3, :), 'b.-');
    plot(sol.x, -sol.y(5, :), 'r.-');
    xlabel('\eta');
    ylabel('F(\eta),G(\eta),-H(\eta)');
    legend('F(\eta)', 'G(\eta)', '-H(\eta)')
    hold off;
end

function dydx = sample1ode(x, y)
    global delta eta lamda N M Pr Nb Nt Ec Sc gamma epsilon;
    % Unpack y values
    f = y(1);
    f_prime = y(2);
    f_double_prime = y(3);
    g = y(4);
    g_prime = y(5);
    h = y(6);
    
    % Compute the derivatives
    dydx = zeros(6, 1);  % Ensure dydx is a column vector of length 6
    
    dydx(1) = f_prime;
    dydx(2) = f_double_prime;
    dydx(3) = -f*f_double_prime+f_prime*f_prime+delta * (f_prime + (eta / 2) * f_double_prime) + M * f_prime - lamda * (g + N * h);
    dydx(4) = g_prime;
    dydx(5) = -Pr * f_prime * g_prime - delta * (eta / 2) * f_prime * Pr + Pr * Nb * (g_prime * h + (Nt / Nb) * g^2) + Pr * Ec * f_double_prime;
    dydx(6) = Sc * f_prime * h + (Nt / Nb) * g_prime - gamma * h + (f - (epsilon * eta / 2) * h);
end

function res = sample1bc(ya, yb)

[Torsten]

"sample1bc" and "sample1init" together with the mathematical description are missing.