如何在Matlab中同时绘制椭圆和抛物线？

% 椭圆参数
x0 = 0;
y0 = 0;
a = 5;
b = 3;
theta = pi/4;

% 抛物线参数
xf = 0;
yf = 2;
p = 1;

% 创建绘图窗口
figure;

% 绘制椭圆
t = linspace(0, 2*pi, 100);
x = x0 + a*cos(t)*cos(theta) - b*sin(t)*sin(theta);
y = y0 + a*cos(t)*sin(theta) + b*sin(t)*cos(theta);
plot(x, y, 'r');
hold on;

% 绘制抛物线
if yf > 0
    x = linspace(xf - 2*p, xf + 2*p, 100);
    y = ((x - xf).^2) / (4*p) + yf;
else
    x = linspace(xf - 2*p, xf + 2*p, 100);
    y = -((x - xf).^2) / (4*p) + yf;
end
plot(x, y, 'b');

% 添加图例和标题
legend('椭圆', '抛物线');
title('椭圆和抛物线绘制');