### 科學運算-矩陣 (一)

1. 安裝 numpy 套件
2. 安裝 SciPy 套件
 程式碼： ```import numpy as np a = np.array([1, 2, 3], float) b = np.array([5, 2, 6], float) def Print(msg, ans): print msg, print ans def PrintFloat(msg, ans): print msg, print '%.2f' % ans def Sum(): ans = (a + b).sum() PrintFloat('sum(a + b) = ', ans) def Mean(): ans = (a + b).mean() PrintFloat('mean(a + b) = ', ans) def StdDev(): ans = (a + b).std() PrintFloat('std(a + b) = ', ans) def Add(): ans = a + b Print('a + b = ', ans) def Minus(): ans = a - b Print('a - b = ', ans) def Multiply(): ans = a * b Print('a * b = ', ans) def Devide(): ans = b / a Print('b / a = ', ans) def Mod(): ans = a % b Print('a % b = ', ans) def Power(): ans = b ** a Print('b ** a = ', ans) def Main(): Sum() Mean() StdDev() print Add() Minus() Multiply() Devide() Mod() Power() if __name__ == "__main__": Main()``` 執行結果： ```sum(a + b) = 19.00 mean(a + b) = 6.33 std(a + b) = 2.05 a + b = [ 6. 4. 9.] a - b = [-4. 0. -3.] a * b = [ 5. 4. 18.] b / a = [ 5. 1. 2.] a % b = [ 1. 0. 3.] b ** a = [ 5. 4. 216.] ```
ċ
numpy-arr-math.py
(1k)

2015年3月8日 下午9:09