2楼: Originally posted by libralibra at 2012-12-27 00:06:53
f0=10;
fs=20;
N=101;
n=0:N-1;
t=n/fs; %%%%%%%%% t是0:101,间隔为1的数列除以20的结果,
x=sin(2*pi*f0*t);  %%%%% x是sin(pi*N)也就是0,pi,2pi,......101pi的正弦值,画出来肯定都是0
subplot(211);
plot( ...

f0=10;
fs=20;
N=101;
n=0:N-1;
t=n/fs; %%%%%%%%% t是0:101,间隔为1的数列除以20的结果,
x=sin(2*pi*f0*t);  %%%%% x是sin(pi*N)也就是0,pi,2pi,......101pi的正弦值,画出来肯定都是0
subplot(211);
plot(t,x);%显示结果不对，不是正弦%%%%%%%%%%应该不是正弦才对
t1=0:0.005:1; %%%%%%%%%%% t1是0到1,间隔0.005,其实间隔只要足够小都行
x1=sin(2*pi*f0*t1); %%%%%%%%%%% x1是sin(20*pi*t1),也就是0,pi/10,pi/5,...20pi的正弦,不全为0,可以做出正弦图像