`AttributeError的：rint`使用numpy.round时

问题描述

我有一个numpy的数组，它看起来像这样：

I have a numpy array that looks like this:

[[41.743617 -87.626839]
 [41.936943 -87.669838]
 [41.962665 -87.65571899999999]]

我要在阵列中四舍五入的数字到小数点后两位，或三个。我试着用numpy.around和numpy.round，但他们两人给我以下错误：

I want to round the numbers in the array to two decimal places, or three. I tried using numpy.around and numpy.round, but both of them give me the following error:

  File "/Library/Python/2.7/site-packages/numpy-1.8.0.dev_3084618_20130514-py2.7-macosx-10.8-intel.egg/numpy/core/fromnumeric.py", line 2452, in round_
    return round(decimals, out)
AttributeError: rint

我用 numpy.around（X，小数= 2）
和 numpy.round（X，小数= 2）

我是不是做错了什么？是否有任何其他的方式来将一个大阵有效地做到这一点？

Am I doing something wrong? Is there any other way to do this efficiently for a large array?

推荐答案

您不能圆numpy的数组，其对象，这可以用 astype 改变，只要您的数组可以安全地转换为浮点数：

You cannot round numpy arrays that are objects, this can be changed with astype as long as your array can be safely converted to floats:

>>> a = np.random.rand(5).astype(np.object)
>>> a
array([0.5137250555772075, 0.4279757819721647, 0.4177118178603122,
       0.6270676923544128, 0.43733218329094947], dtype=object)

>>> np.around(a,3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/fromnumeric.py", line 2384, in around
    return round(decimals, out)
AttributeError: rint

>>> np.around(a.astype(np.double),3)
array([ 0.514,  0.428,  0.418,  0.627,  0.437])

您会收到字符串类似的错误，UNI code，无效的，和char类型数组。

You will receive similar errors with string, unicode, void, and char type arrays.

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