已知每隔0.25秒给出一个(x(t),y(t))的位子
x=[1.0 0.9 1.0 1.1 1.8 0.9 0.9 0.9 1.1 1.8];
y=[1.9 1.6 1.5 1.45 1.5 1.5 1.3 0.5 0.1 0.3];
1）分段线性插值法（piecewise linear interpolation)
2）三次样条插值与非扭结结束条件(cubic spline interpolation with not-a-knot end conditions)

用matlab分别画出(x(t),y(t))的轨迹

求各位大神帮忙