matlab 画频谱MATLAB画时域离散信号频谱时,时域坐标和频谱坐标怎么对应.求程序

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%只是一个正弦的频谱
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clear;
close all
dt=0.1;
t=0:dt:10;
y=5*sin(pi*t);
plot(t,y);
N=length(t);
df=1/dt;
F=df/N*(-N/2:N/2-1);
T=fft(y);
T=fftshift(T);
figure
plot(F,T)