38 lines
832 B
Python
38 lines
832 B
Python
import numpy as np
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# 可以由元组创建 ， 也可由列表创建
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a = np.array(((1,2,3,4,5),(6,7,8,9,10),(11,12,13,14,15),(22,33,44,55,66)))
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print(f"a = {a}")
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a1 = a[np.ix_([0,2,3],[1,2])]
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print(f"a1 = {a1}")
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a2 = a[1,2]
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print(f"a2 = {a2}")
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a3 = a[0:2,:]
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print(f"a3 = {a3}")
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# 数组改变形状
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a4 = a.reshape(2,10)
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print(f"a4 = {a4}")
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a5 = a.ravel()
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print(f"a5 = {a5}")
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a6 = a.ravel()
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print(f"a6 = {a6}")
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a7 = a.reshape(-1)
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print(f"a7 = {a7}")
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a8 = np.vstack([a7,a6])
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print(f"a8 = {a8}")
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a9 = np.hstack([a7,a6])
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print(f"a9 = {a9}")
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a = np.array(((1,2,3,4,5),(6,7,8,9,10),(11,12,13,14,15),(22,33,44,55,66)))
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b = np.array(((22,33,44,55,66),(6,7,8,9,10),(11,12,13,14,15),(1,2,3,4,5)))
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a10 = a[a==b]
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print(f"a10 = {a10}")
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a11 = np.where(a>10,100,a)
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print(f"a11 = {a11}")
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a12 = np.where(a>10,100,-100)
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print(f"a12 = {a12}")
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