scipy.stats.halfgennorm()是廣義正常連續隨機變量的上半部分。為了完成其規格,它以標準格式和一些形狀參數定義。對象對象從中繼承了通用方法的集合,並用特定的細節來完善它們。
參數:
-> α:scale -> β:shape -> μ:location
代碼1:創建半廣義普通連續隨機變量
from scipy.stats import halfgennorm
numargs = halfgennorm.numargs
[a] = [0.7, ] * numargs
rv = halfgennorm (a)
print ("RV:\n", rv)
輸出:
RV: scipy.stats._distn_infrastructure.rv_frozen object at 0x0000021FB55D8DD8
代碼2:半廣義隨機變量和概率分布
import numpy as np
quantile = np.arange (0.01, 1, 0.1)
# Random Variates
R = halfgennorm .rvs(.2, scale = 2, size = 10)
print ("Random Variates:\n", R)
# PDF
R = halfgennorm .pdf(quantile, .2, loc = 0, scale = 1)
print ("\nProbability Distribution:\n", R)
輸出:
Random Variates: [1.41299459e+03 3.51301175e+04 1.79981484e+05 2.90925518e+02 2.70178121e+05 1.31706797e+05 3.25898913e+01 1.62607410e+04 2.02263946e+04 1.97078668e+04] Probability Distribution: [0.00559658 0.0043805 0.00400834 0.0037776 0.00360957 0.00347731 0.00336825 0.00327549 0.00319482 0.00312348]
代碼3:圖形表示。
import numpy as np
import matplotlib.pyplot as plt
distribution = np.linspace(0, np.minimum(rv.dist.b, 3))
print("Distribution:\n", distribution)
plot = plt.plot(distribution, rv.pdf(distribution))
輸出:
Distribution: [0. 0.06122449 0.12244898 0.18367347 0.24489796 0.30612245 0.36734694 0.42857143 0.48979592 0.55102041 0.6122449 0.67346939 0.73469388 0.79591837 0.85714286 0.91836735 0.97959184 1.04081633 1.10204082 1.16326531 1.2244898 1.28571429 1.34693878 1.40816327 1.46938776 1.53061224 1.59183673 1.65306122 1.71428571 1.7755102 1.83673469 1.89795918 1.95918367 2.02040816 2.08163265 2.14285714 2.20408163 2.26530612 2.32653061 2.3877551 2.44897959 2.51020408 2.57142857 2.63265306 2.69387755 2.75510204 2.81632653 2.87755102 2.93877551 3. ]
代碼4:更改位置參數
import matplotlib.pyplot as plt
import numpy as np
x = np.linspace(0, 5, 100)
# Varying positional arguments
y1 = halfgennorm .pdf(x, 1, 3)
y2 = halfgennorm .pdf(x, 1, 4)
plt.plot(x, y1, "*", x, y2, "r--")
輸出:
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