[英]Generate 3 different random number in Python
I am beginner in python. 我是python的新手。 I want to generate 3 set of different number within specified range using
numpy.random.randint
in python3. 我想在python3中使用
numpy.random.randint
在指定范围内生成3套不同的数字。 (FYI -> Want to implement K-Means) (仅供参考->要实施K-Means)
I am using this code 我正在使用此代码
# Number of clusters
k = 3
# X coordinates of random centroids
C_x = np.random.randint(38.8, 39.4, size=k)
# Y coordinates of random centroids
C_y = np.random.randint(-77.5,-76.5, size=k)
C = np.array(list(zip(C_x, C_y)), dtype=np.float32)
print(C)
But each iteration gives me same set of values 但是每次迭代都给我相同的一组值
[[ 38. -77.]
[ 38. -77.]
[ 38. -77.]]
Where am I going wrong? 我要去哪里错了?
The randint()
function operates on integers ; randint()
函数对整数进行运算; your floats are floored to integers before taking the random value. 您的浮点数必须取整为整数,然后再取随机值。 Because the second values is exclusive , you are producing a range of just one value each.
由于第二个值是互斥的 ,因此您生成的每个值的范围仅为一个 。
Either pass in integers for the low and high values (and pick a larger range), or use one of the distribution functions . 为低和高值传递整数 (并选择较大的范围),或者使用分布函数之一 。 The
numpy.random.uniform()
function is fine for your needs, I presume? 我
numpy.random.uniform()
函数适合您的需求吗?
>>> C_x = np.random.uniform(38.8, 39.4, size=k)
>>> C_y = np.random.uniform(-77.5,-76.5, size=k)
>>> np.array(list(zip(C_x, C_y)), dtype=np.float32)
array([[ 39.04865646, -76.83393097],
[ 39.06672668, -76.70361328],
[ 39.35120773, -77.00741577]], dtype=float32)
I used numpy.random.uniform
我用了
numpy.random.uniform
# Number of clusters
k = 3
# X coordinates of random centroids
C_x = np.random.uniform(38.8, 39.4, size=k)
# Y coordinates of random centroids
C_y = np.random.uniform(-77.5,-76.5, size=k)
C = np.array(list(zip(C_x, C_y)), dtype=np.float32)
print(C)
and it worked. 而且有效。
[[ 38.88471603 -77.37638855]
[ 38.99485779 -76.99333954]
[ 38.97389603 -77.27649689]]
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