R 中的符号 ::: 是什么意思 [英] What does the symbol ::: mean in R

问题描述

我在 B. Pfaff 的R 中综合和协整时间序列分析"的以下上下文中遇到了这一点

I came across this in the following context from B. Pfaff's "Analysis of Integrated and Cointegrated Time Series in R"

## Impulse response analysis of SVAR A−type model 1
args (vars ::: irf.svarest) 2
irf.svara <− irf (svar.A, impulse = "y1 " , 3
response = "y2 " , boot = FALSE) 4
args (vars ::: plot.varirf) 5
plot (irf.svara)

推荐答案

来自帮助文件(你可以用help(":::")看到这个):

From the help file (you can see this with help(":::")):

The expression 'pkg::name' returns the value of the exported
     variable 'name' in package 'pkg' if the package has a name space.
     The expression 'pkg:::name' returns the value of the internal
     variable 'name' in package 'pkg' if the package has a name space.

换句话说，::: 用于直接访问内部包的成员(即不是从 NAMESPACE 导出的).

In other words ::: is used to directly access a member of a package that is internal (i.e. not exported from the NAMESPACE).

请参阅此相关问题:R:从命名空间调用函数.

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