gusucode.com > 《精通matlab 7》包括配套光盘 > 配套光盘里的程序附件/Ex-16/Ex1606.m
%例16-6 二维插值方法效果比较 [x,y] = meshgrid(-3:1:3); %产生已知数据栅格点 z = peaks(x,y); %计算已知点上的函数值 surf(x,y,z) %画基于已知数据点的三维表面图,如图16-8 title('graphic based on original data') %对图形加标题 [xi,yi] = meshgrid(-3:0.25:3); %产生更精细的插值栅格点 zi1 = interp2(x,y,z,xi,yi,'nearest'); surf(xi,yi,zi1) %画基于最邻近法插值的三维表面图,如图16-9 title('nearest-interpolation method') zi2 = interp2(x,y,z,xi,yi,'linear'); surf(xi,yi,zi2) %画基于二维分段线性插值的三维表面图,如图16-10 title('linear-interpolation method') zi3 = interp2(x,y,z,xi,yi,'cubic'); surf(xi,yi,zi3) %画基于二维三次多项式插值的三维表面图,如图16-11 title('cubic-interpolation method')