exp5_21.m

来自「是Digital signal processing--using Matlab」· M 代码 · 共 10 行

Nmax=2048;
fft_time=zeros(1,Nmax);
for n=1:1:Nmax
    x=rand(1,n);
    t=clock;
    fft(x);
    fft_time(n)=etime(clock,t);
end
n=[1:1:Nmax];
plot(n,fft_time,'.')