NumPy：ベクトルの長さ（絶対値、ノルム）を求める
ベクトルの長さ（絶対値、ノルム）は linalg.norm で求めます。
入力
import numpy as np
a = np.array([3, 4])
x = np.linalg.norm(a)
print(x) # 5.0小数点がつきます。
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ベクトルの長さ（絶対値、ノルム）は linalg.norm で求めます。
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