numpy.inf - numpy.infty

﹏ヽ暗。殇╰゛Y 2023-02-20 08:24 21阅读 0赞

#  numpy.inf - numpy.infty #

## 1. numpy.inf ##

IEEE 754 floating point representation of (positive) infinity.

infinity /ɪnˈfɪnəti/：n. 无穷，无限大，无限距
    aliase：n. 别名

### 1.1 Returns ###

`y : float`  
A floating point representation of positive infinity.  
正无穷大的浮点表示。

NumPy uses the IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754). This means that Not a Number is not equivalent to infinity. Also that positive infinity is not equivalent to negative infinity. But infinity is equivalent to positive infinity.  
NumPy 使用 IEEE Standard for Binary Floating-Point for Arithmetic (IEEE 754)。这意味着 Not a Number 不等于无穷大。同样，正无穷大不等于负无穷大。但是无穷大等于正无穷大。

`Inf`, `Infinity`, `PINF` and `infty` are aliases for `inf`.

### 1.2 Examples ###

(pt-1.4_py-3.6) yongqiang@yongqiang:~$ python
    Python 3.6.10 |Anaconda, Inc.| (default, May  8 2020, 02:54:21)
    [GCC 7.3.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import numpy as np
    >>> np.inf
    inf
    >>>
    >>> -np.inf
    -inf
    >>>
    >>> np.array([1]) / 0.
    array([inf])
    >>>
    >>> exit()
    (pt-1.4_py-3.6) yongqiang@yongqiang:~$

## 2. numpy.infty ##

IEEE 754 floating point representation of (positive) infinity.  
IEEE 754 浮点表示 (正) 无穷大。

Use `inf` because `Inf`, `Infinity`, `PINF` and `infty` are aliases for `inf`.  
使用 `inf` 是因为 `Inf`，`Infinity`，`PINF` 和 `infty` 是 `inf` 的别名。