GPT答：

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function y_prime = euler_method(x, y, y_prime)
    h = 0.1; % 步长
    x_values = 0:h:3;
    
    for i=1:length(x_values)-1
        y_double_prime = -3*y_prime - 2*y; % 根据微分方程求解y''
        y = y + h * y_prime; % 更新y
        y_prime = y_prime + h * (y_double_prime); % 更新y'
    end
    
end

% 初始条件
x_0 = 0;
y_0 = 2;
y_1prime_0=1;

% 调用函数并输出结果
result=euler_method(x_0,y_0,y_1prime);
disp(result);