根据此代码，请给出绘制入射电场与反射电场的合成电场幅度图的代码，最后图像应呈现出合成电场幅度

好的，以下是绘制入射电场与反射电场的合成电场幅度图的 Matlab 代码：

k = 2;
omega = 2 * pi;
x1 = (0:0.3:30);
z1 = (30:-0.3:0);
x2 = (30:0.3:60);
z2 = (0:0.3:30);
Ei = zeros(size(x1));
Er = zeros(size(x1));
l = zeros(size(x1));
t = 0;

for i = 1:300
    if i <= 101
        Ei(1:i) = cos(20 * pi * t - 0.35 * (x1(1:i) - z1(i:i)));
    end
    
    if i > 101
        Ei = cos(20 * pi * t - 0.35 * (x1 - z1));
        if i <= 202
            Er(1:i-101) = -cos(20 * pi * t - 0.35 * (x2(1:i-101) + z2(1:i-101)));
        end
        if i > 202
            Er = -cos(20 * pi * t - 0.35 * (x2 + z2));
        end
    end
    
    E = Ei + Er; % 计算合成电场
    
    % 绘制入射电场、反射电场和合成电场的电场幅度图
    subplot(3, 1, 1);
    plot(x1, Ei, 'b-');
    axis([0, 60, -2, 2]);
    xlabel('x');
    ylabel('Electric Field');
    title('Incident Wave');
    
    subplot(3, 1, 2);
    plot(x2, Er, 'r-');
    axis([0, 60, -2, 2]);
    xlabel('x');
    ylabel('Electric Field');
    title('Reflected Wave');
    
    subplot(3, 1, 3);
    plot([x1, x2], E, 'g-');
    axis([0, 60, -2, 2]);
    xlabel('x');
    ylabel('Electric Field');
    title('Electric Field Amplitude');
    
    drawnow;
    
    t = t + 0.001;
end

在这段代码中，首先计算出入射电场 E