exa8_16.m

来自「有关matlab r2007的实用教程」· M 代码 · 共 9 行

x=1:99;
y=1:99;
[X,Y]=meshgrid(x,y);
A=zeros(99,99);
A(49:51,49:51)=1;
B=fft2(A);
subplot(1,2,1),mesh(X,Y,A);
subplot(1,2,2),mesh(X,Y,abs(B));