没有 Sympy 的两侧限制? [英] No Sympy two-sided limits?

问题描述

我无法让 Sympy 处理两侧限制.在 Jupyter notebook 中运行，Anaconda 安装:

from sympy import *x = 符号('x')限制(1/x,x,0)

给出了oo的答案.此外，

限制(1/x,x,0)

打印为右侧限制.事实上，我所有的两侧限制都漂亮地打印"为右侧限制.他们似乎也被这样评价.找不到强制双面的方法.当然，我们可以编写一个简短的程序来解决这个问题.

我做错了什么?

解决方案

limit 有第四个参数，dir，它指定一个方向:

<预><代码>>>>限制(1/x，x，0，'+')哦>>>限制(1/x，x，0，'-')-oo>>>限制(1/x，x，0)哦

默认是从右边开始.双向限制尚未直接实施，但您可以轻松检查两个方向.

I can't get Sympy to handle two-sided limits. Running in a Jupyter notebook, Anaconda installation:

from sympy import *
x = symbols('x')
limit(1/x,x,0)

gives an answer of oo. Furthermore,

Limit(1/x,x,0)

prints as a right-sided limit. In fact, all of my two-sided limits 'pretty-print' as right-sided limits. They seem to be evaluated that way, too. Can't find a way to force two-sided. Of course, one could write a short program to remedy this.

What am I doing wrong?

解决方案

limit has a fourth argument, dir, which specifies a direction:

>>> limit(1/x, x, 0, '+')
oo
>>> limit(1/x, x, 0, '-')
-oo
>>> limit(1/x, x, 0)
oo

The default is from the right. Bidirectional limits are not directly implemented yet, but you can easily check both directions.

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