r - R 包版本中的连字符 (`-` )

Question

我依赖的包列表版本如 4.0.4还有0.9-7甚至 0.9-7.1 . (参见 here)。
连字符( - )在包版本控制中是什么意思？如何对其进行版本比较？我找不到任何关于此的文档。

Answer 1

连字符( - )在包版本控制中是什么意思？
连字符在 ?numeric_version 中提到:

"Numeric versions are sequences of one or more non-negative integers, usually (e.g., in package 'DESCRIPTION' files) represented as character strings with the elements of the sequence concatenated and separated by single . or - characters. R package versions consist of at least two such integers."

这里不区分句号 .和连字符 - .但是，正如 Hadley 和 Brian 在 R Packages; Package metadata - Version 中所指出的那样:

I don’t recommend taking full advantage of R’s flexibility. Instead always use . to separate version numbers.

他们指的是 Semantic Versioning ，其中 use of hyphen is described :

A pre-release version MAY be denoted by appending a hyphen and a series of dot separated identifiers immediately following the patch version.

如何对其进行版本比较？
版本对比见 r check if package version is greater than x.y.z和 R Packages; Package metadata - Version .