matlab 傅里叶逆变换load mtlb;subplot(2,2,1),plot(mtlb)x1=fft(mtlb);y=abs(x1);subplot(2,2,2),plot(y)for n=0:4000if y

matlab 傅里叶逆变换load mtlb;subplot(2,2,1),plot(mtlb)x1=fft(mtlb);y=abs(x1);subplot(2,2,2),plot(y)for n=0:4000if y
matlab 傅里叶逆变换
load mtlb;
subplot(2,2,1),plot(mtlb)
x1=fft(mtlb);
y=abs(x1);
subplot(2,2,2),plot(y)
for n=0:4000
if y

matlab 傅里叶逆变换load mtlb;subplot(2,2,1),plot(mtlb)x1=fft(mtlb);y=abs(x1);subplot(2,2,2),plot(y)for n=0:4000if y
t逆变换不行的,因为傅立叶变换值是复数,一旦取模,就回不来了,要想逆变换,变换的值不能取模,所以这样,不要取模,判断条件取模,就好