Introduction to other applications of numpy

a code

1. import numpy as np
2. from numpy.linalg import*
3. print("FFT:")
4. print(np.fft.fft(np.array([1,1,1,1,1,1,1,1])))
5. #相关系数
6. print("Coef:")
7. print(np.corrcoef([1,0,1],[0,2,1]))
8. #一元多次函数
9. print(np.poly1d([2,1,3]))

Second run results

FFT:

[ 8.+0.d 0.+0.d 0.+0.d 0.+0.d 0.+0.d 0.+0.d 0.+0.d 0.+0.d]

Coef:

[[ 1.        -0.8660254]

 [-0.8660254  1.       ]]

   2

2 x + 1 x + 3