python随机抽样numpy_numpy随机采样ranf()⽤法及代码
⽰例
numpy.random.ranf()是⽤于在numpy中进⾏随机采样的功能之⼀。它返回指定形状的数组,并在half-open间隔中填充随机浮点数[0.0, 1.0).
⽤法: numpy.random.ranf(size=None)
参数:
random pythonsize :[int或int元组,可选]输出形状。如果给定的形状是例如(m,n,k),则绘制m * n * k个样本。默认值为⽆,在这种情况下,将返回单个值。
Return :间隔中的随机浮动数组[0.0, 1.0).如果未提供尺⼨,则为单个此类随机浮动。
代码1:
# Python program explaining
# numpy.random.ranf() function
# importing numpy
import numpy as geek
# output random float value
out_val = geek.random.ranf()
print ("Output random float value:", out_val)
输出:
Output random float value: 0.0877051588430926
代码2:
# Python program explaining
# numpy.random.ranf() function
# importing numpy
import numpy as geek
# output array
out_arr = geek.random.ranf(size =(2, 1))
print ("Output 2D Array filled with random floats:", out_arr)
输出:
Output 2D Array filled with random floats: [[ 0.14186407]
[ 0.58068259]]
代码3:
# Python program explaining
# numpy.random.ranf() function
# importing numpy
import numpy as geek
# output array
out_arr = geek.random.ranf((3, 3, 2))
print ("Output 3D Array filled with random floats:", out_arr)
输出:
Output 3D Array filled with random floats: [[[ 0.11013584 0.67844746] [ 0.84691569 0.09467084]
[ 0.69918864 0.12137178]]
[[ 0.30629051 0.28301093]
[ 0.1302665 0.2196221 ]
[ 0.51555358 0.73191852]]
[[ 0.72806359 0.66485275]
[ 0.80654791 0.04947181]
[ 0.06380535 0.99306064]]]
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