拉格郎日插值matlab.txt

来自「数值计算方法」· 文本 代码 · 共 28 行

>> x=[0.4 0.5 0.6 0.7 0.8];
>> y=[-0.916291 -0.693147 -0.510826 -0.356675 -0.223144];
>> T=interp1(x,y,0.54,'linear')　　 %线性插值

T =

　 -0.6202

>> T=interp1(x,y,0.54,'nearest')　 % 最近邻点插值

T =

　 -0.6931

>> T=interp1(x,y,0.54,'spline')　 % 三次样条插值

T =

　 -0.6161

>> T=interp1(x,y,0.54,'cubic')　　%三次插值

T =

　 -0.6161

>>