fg_04_18.m

来自「英文书《Digital Signal Processing with Examp」· M 代码 · 共 10 行

% fg_04_18
% Chapter 4, fig. 4.18. Ratio of convolution times.
sp_fig(1);
K=2.^[2:20];
r=K./(12*(1+log2(K)));
h=semilogy(log2(K),r,'o'); grid;
set(h,'color','k','linewidth',.75);
set(gca,'fontname','times','fontsize',16);
ylabel('Ratio of direct products to FFT products');
xlabel('log_2({\itK})=log_2(FFT size/2)')