R中的极限指令? [英] Limit Command in R?

问题描述

R中的极限指令或功能是什么?

What is the take a limit command or function in R?

(我无法通过使用?和??函数或入门手册进行搜索来找到它.lim()和limit()不存在.)

(I could not find it by searching using ? and ?? functions or in introductory manuals. lim() and limit() do not exist.)

在某种意义上说是F(X)的极限X-> Y +.我并不是说有人在写代码；我的意思是，作为已安装的标准包含在R中，提供的功能称为什么.

This is in the sense of limit X->Y+ of F(X). I don't mean anyone writing code; I mean, included in R as installed standard, what the supplied function is called.

(注意:我之前对这个主题的问题已被编辑，以使其完全清楚……但仍处于搁置状态……我想主持人忘记了它……因此出现了这个问题.)

(Note: my previous question on this topic has been edited to be fully clear ... but it is still on hold... I suppose that moderators forgot about it ... hence this question.)

推荐答案

Ryacas软件包可以进行限制:

The Ryacas package can do limits:

library(Ryacas)     # version 1.1.1
x <- ysym("x")      # define x as a symbolic variable
lim(sin(x)/x, x, 0) # limit of sin(x)/x as x approaches 0
## 1

或在Ryacas0

library(Ryacas)
x <- Sym("x") # define x as a symbolic variable
Limit(sin(x)/x, x, 0) # limit of sin(x)/x as x approaches 0
## expression(1)

还有rSymPy软件包:

Also the rSymPy package:

library(rSymPy)    # version 0.2-1.2
sympy("var('x')")  # define x as a symbolic variable
## [1] "x"
sympy("limit(sin(x)/x, x, 0)")
## [1] "1"

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