脾气暴躁的天花板和地板“出"争论 [英] Numpy Ceil and Floor "out" Argument

问题描述

从NumPy中有关ceil的文档，numpy.ceil函数带有两个参数，第二个参数是out.文档未说明此out参数的作用，但我假设您可以设置此函数返回的输出类型，但我无法使其正常工作:

From the NumPy docs for ceil , the numpy.ceil function takes two arguments, the second being out. The docs don't say what this out parameter does but I assume you can set the output type this function returns, but I cannot get it to work:

In [107]: np.ceil(5.5, 'int')
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-107-c05bcf9f1522> in <module>()
----> 1 np.ceil(5.5, 'int')

TypeError: return arrays must be of ArrayType

In [108]: np.ceil(5.5, 'int64')
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-108-0937d09b0433> in <module>()
----> 1 np.ceil(5.5, 'int64')

TypeError: return arrays must be of ArrayType

是否可以使用此参数使np.ceil返回整数?

Is it possible to use this argument to make np.ceil return an integer?

谢谢.

推荐答案

out是输出 array (必须与输入的形状相同).

out is the output array (which must have the same shape as the input).

如果将其构造为所需的dtype，则将是您得到的dtype:

If you construct it to be of the desired dtype, that'll be the dtype you get:

>>> arr = np.array([5.5, -7.2])
>>> out = np.empty_like(arr, dtype=np.int64)
>>> np.ceil(arr, out)
array([ 6, -7], dtype=int64)
>>> out
array([ 6, -7], dtype=int64)

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