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
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![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](/uploads/image/z/10050987-3-7.jpg?t=matlab+%E5%82%85%E9%87%8C%E5%8F%B6%E9%80%86%E5%8F%98%E6%8D%A2load+mtlb%3Bsubplot%282%2C2%2C1%29%2Cplot%28mtlb%29x1%3Dfft%28mtlb%29%3By%3Dabs%28x1%29%3Bsubplot%282%2C2%2C2%29%2Cplot%28y%29for+n%3D0%3A4000if+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