yi = interp1(x,y,xi,method) 已知样本点坐标x,y,求xi处的函数值yi,插值方法是method method有以下几种: 'nearest'邻近点插值 'linear'线性插值(默认) 'spline'三次样条函数插值 'cubic'三次函数插值 常用的是'spline'和'cubic' 例子: x = 0:10; y = sin(x); xi = 0:.25:10; yi = interp1(x,y,xi,'spline'); plot(x,y,'o',xi,yi)