www.gusucode.com > signal 案例源码程序 matlab代码 > signal/PeriodicAndAperiodicSincFunctionsExample.m
%% Periodic and Aperiodic Sinc Functions % The Dirichlet and sinc functions are related by $D_N(\pi x)=\mathop{\rm % sinc}\nolimits(Nx/2)/\mathop{\rm sinc}\nolimits(x/2)$. Illustrate this % fact for $N=6$. xmax = 2; x = linspace(-xmax,xmax,1001)'; N = 6; yd = diric(x*pi,N); ys = sinc(N*x/2)./sinc(x/2); subplot(2,1,1) plot(x,yd) title('D_6(x*pi)') subplot(2,1,2) plot(x,ys) title('sinc(6*x/2) / sinc(x/2)') %% % Repeat the calculation for $N=9$. N = 9; yd = diric(x*pi,N); ys = sinc(N*x/2)./sinc(x/2); subplot(2,1,1) plot(x,yd) title('D_9(x*pi)') subplot(2,1,2) plot(x,ys) title('sinc(9*x/2) / sinc(x/2)')