是啊,看着难受
比如这个:
原版
How the FFT works
The FFT is a complicated algorithm, and its details are usually left to those that
specialize in such things. This section describes the general operation of the
FFT, but skirts a key issue: the use of complex numbers. If you have a
background in complex mathematics, you can read between the lines to
understand the true nature of the algorithm. Don't worry if the details elude
you; few scientists and engineers that use the FFT could write the program
from scratch.