fg_03_04.m

来自「英文书《Digital Signal Processing with Examp」· M 代码 · 共 18 行

% fg_03_04
% Chapter 3, Fig. 4. - Compass plot.
N=8;
n=0:N-1;
W=exp(j*2*pi/N);

sp_fig(1); clf;
compass(W.^n,'k');
set(gca,'visible','off')
dx=.1*real(W)+.01; dy=.07*imag(W)-.03;
msg=char('W^0=W^8=W^{16}=...','W^7=W^{15}=W^{23}=...',...
         'W^6=W^{14}=W^{22}=...','W^5=W^{13}=W^{21}=...',...
         'W^4=W^{12}=W^{20}=...','W^3=W^{11}=W^{19}=...',...
         'W^2=W^{10}=W^{18}=...','W^1=W^9=W^{17}=...');
x=[1.15 0.77 -0.30 -1.65 -2.05 -1.55 -0.30  0.77];
y=[0.00 0.73  1.22  0.73  0.00 -0.75 -1.22 -0.75];
text(x,y,msg,'fontname','times','fontsize',16);