121 lines
1.6 KiB
Python
121 lines
1.6 KiB
Python
import numpy as np
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a1 = np.array([1, 2, 3, 4, 5])
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print(a1)
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a2 = np.zeros((2, 3), dtype=int)
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print(a2)
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print(a1.shape)
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print(a2.shape)
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a3 = np.ones((2, 4), dtype=int)
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print(a3)
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a4 = np.arange(1, 10)
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print(a4)
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a5 = np.linspace(1, 6, 4)
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print(a5)
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a6 = np.random.rand(2, 4)
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print("a6: " + a6.__str__())
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a7 = a5.astype(int)
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print(a7)
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a8 = np.linspace(1, 10, 4).astype(int)
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a9 = np.linspace(1, 6, 4).astype(int)
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print(a8)
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print(a9)
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a10 = np.dot(a8, a9)
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print(a10)
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a11 = np.zeros((2, 3), dtype=int)
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a11[0] = np.linspace(1, 10, 3).astype(int)
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a11[1] = np.linspace(1, 11, 3).astype(int)
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print(a11)
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# numpy数组可以直接进行线性变换 即广播
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a12 = (1 + (10 - 1) * np.random.rand(2, 2)).astype(int)
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a13 = (1 + (10 - 1) * np.random.rand(2, 2)).astype(int)
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print("a12: " + a12.__str__())
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print("a13: " + a13.__str__())
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# 矩阵乘法 写法等同
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a14 = a12 @ a13
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print(a14)
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a14 = np.dot(a12, a13)
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print(a14)
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a14 = np.matmul(a12, a13)
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print(a14)
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a15 = np.sqrt(a12)
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print(a15)
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a16 = np.sin(a12)
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a17 = np.cos(a12)
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print(a16)
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print(a17)
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a18 = np.log(a12)
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print(a18)
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a19 = np.power(a12, 2)
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print(a19)
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ax1 = (1 + (10 - 1) * np.random.rand(1, 7)).astype(int)
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print("ax1: " + ax1.__str__())
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a20 = np.max(np.abs(ax1))
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a21 = np.min(np.abs(ax1))
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print(a20)
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print(a21)
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a22 = np.argmax(np.abs(ax1))
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a23 = np.argmin(np.abs(ax1))
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print(a22)
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print(a23)
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a24 = np.sum(np.abs(ax1))
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print(a24)
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a25 = np.mean(np.abs(ax1))
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print(a25)
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a26 = np.median(np.abs(ax1))
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print(a26)
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# 方差
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a27 = ax1.var()
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print(a27)
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a28 = ax1.std()
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print(a28)
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a29 = ax1[(ax1 > 3) & (ax1 % 2 == 0)]
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print(a29)
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a30 = ax1[0, 0:6:2]
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print(a30)
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# 反转数组
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a31 = ax1[::-1]
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print(a31)
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