其实很简单，你只要删除很多空格即可比如 length of x=length(x)改成lengthofx=length(x)。其他一样。
代码
x=[0,3,5,7,9,11,12,13,14,15];
y=[0,1.2,1.7,2.0,2.1,2.0,1.8,1.2,1.4,1.6];
lengthofx=length (x);
scalarx=[x(1):0.5:x(lengthofx)];
lengthofx=length (scalarx);
for i=1:lengthofx;
ynearest(i)=interp1(x,y,scalarx(i),'nearest');
ylinear(i)=interp1(x,y,scalarx(i),'linear');
yspline(i)=interp1(x,y,scalarx(i),'spline');
ycubic(i)=interp1(x,y,scalarx(i),'cubic');
end
subplot(2,2,1),plot(x,y,'*'),hold on,plot(scalarx,ynearest),title('method=nearest');
subplot(2,2,2),plot(x,y,'*'),hold on,plot(scalarx,ylinear),title('method=linear');
subplot(2,2,3),plot(x,y,'*'),hold on,plot(scalarx,yspline),title('method=spline');
subplot(2,2,4),plot(x,y,'*'),hold on,plot(scalarx,ycubic),title('method=cubic');
复制上述指令我也画出图来了，看来最小临近法插值效果不平滑
%interpolation using the four methods
x=[0,3,5,7,9,11,12,13,14,15];
y=[0,1.2,1.7,2.0,2.1,2.0,1.8,1.2,1.4,1.6];
length_of_x=length(x);
scalar_x=[x(1):0.5:x(length_of_x)];
length_of_sx=length (scalar_x);
for i=1:length_of_sx;
y_nearest(i)=interp1(x,y,scalar_x(i),'nearest');
y_linear(i)=interp1(x,y,scalar_x(i),'linear');
y_spline(i)=interp1(x,y,scalar_x(i),'spline');
y_cubic(i)=interp1(x,y,scalar_x(i),'cubic');
end
subplot(2,2,1),plot(x,y,'*'),hold on,plot(scalar_x,y_nearest),title('method=nearest');
subplot(2,2,2),plot(x,y,'*'),hold on,plot(scalar_x,y_linear),title('method=linear');
subplot(2,2,3),plot(x,y,'*'),hold on,plot(scalar_x,y_spline),title('method=spline');
subplot(2,2,4),plot(x,y,'*'),hold on,plot(scalar_x,y_cubic),title('method=cubic');
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电脑是win7的？不是就是电脑坏了
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