numpy ranf()函数中的随机采样
numpy.random.ranf()是numpy中做随机抽样的函数之一。它返回一个指定形状的数组,并在半开区间[0.0, 1.0]内填充随机浮点数。
语法: numpy.random.ranf(size=None)
参数 :
size : [int or tuple of ints, optional] 输出形状。如果给定的形状是,例如,(m, n, k),那么将绘制m * n * k的样本。默认为无,在这种情况下,将返回一个单一的值。
返回:区间[0.0, 1.0]的随机浮点数数组。如果没有提供大小,则为单个此类随机浮点数。
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]]]