我正在尝试使用Numpy为整数和浮点数生成随机的64位整数值,在该类型的整个有效值范围内.要生成随机的32位浮点数,我可以使用:
In [2]: np.random.uniform(low=np.finfo(np.float32).min,high=np.finfo(np.float32).max,size=10)
Out[2]:
array([ 1.47351436e+37, 9.93620693e+37, 2.22893053e+38,
-3.33828977e+38, 1.08247781e+37, -8.37481260e+37,
2.64176554e+38, -2.72207226e+37, 2.54790459e+38,
-2.47883866e+38])
但如果我尝试将其用于64位数字,我会得到
In [3]: np.random.uniform(low=np.finfo(np.float64).min,high=np.finfo(np.float64).max,size=10)
Out[3]: array([ Inf, Inf, Inf, Inf, Inf, Inf, Inf, Inf, Inf, Inf])
类似地,对于整数,我可以成功生成随机32位整数:
In [4]: np.random.random_integers(np.iinfo(np.int32).min,high=np.iinfo(np.int32).max,size=10)
Out[4]:
array([-1506183689, 662982379, -1616890435, -1519456789, 1489753527,
-604311122, 2034533014, 449680073, -444302414, -1924170329])
但是64位整数不成功:
In [5]: np.random.random_integers(np.iinfo(np.int64).min,high=np.iinfo(np.int64).max,size=10)
---------------------------------------------------------------------------
OverflowError Traceback (most recent call last)
/Users/tom/tmp/<ipython console> in <module>()
/Library/Python/2.6/site-packages/numpy/random/mtrand.so in mtrand.RandomState.random_integers (numpy/random/mtrand/mtrand.c:6640)()
/Library/Python/2.6/site-packages/numpy/random/mtrand.so in mtrand.RandomState.randint (numpy/random/mtrand/mtrand.c:5813)()
OverflowError: long int too large to convert to …