Cannot get multiple outputs on matlab function

I have two functions below (the first one calls the second one) and it only gives one output

function [theta, J_history, Tet1, Tet2] = gradientDescent(X, y, theta, alpha, num_iters)
% Initialize some useful values
m = length(y); % number of training examples
J_history = zeros(num_iters, 1);

for iter = 1:num_iters
    temp0 = 0;
    temp1 = 0;
    
    for i = 1:m
        temp0 = temp0 + (theta' * X(i,:)' - y(i));
        temp1 = temp1 + (theta' * X(i,:)' - y(i)) * X(i,2);
    end
    
    theta(1) = theta(1) - (alpha/m) * temp0;
    theta(2) = theta(2) - (alpha/m) * temp1;
    Tet1(iter,1)=theta(1);
    Tet2(iter,1)=theta(2);
    % Save the cost J in every iteration    
    J_history(iter) = computeCost(X, y, theta);
end
 end

And second function'

function J = computeCost(X, y, theta)

m = length(y); % number of training examples
J = 0;
for i = 1:m
    J = J + (theta' *  X(i,:)' - y(i))^2;
end
J = J/(2*m);
end

Answer 1

[Steven Lord]

How many output arguments do you specify when you call gradientDescent?

If you don't specify any, the first output gradientDescent is declared to return (theta) is returned and stored in the variable named ans.

If you specify one like "myOut = gradientDescent(...)", the theta variable computed by gradientDescent is returned and stored in that variable.

If you specify two like "[myOut1, myOut2] = gradientDescent(...)", theta is returned and stored in the first of your output arguments, while J_history is returned and stored in the second of your output arguments.

That pattern continues for three and four output arguments.