r 检查包版本是否大于 x.y.z [英] r check if package version is greater than x.y.z

问题描述

R 软件包的版本号为 1.97.1.我可以用

R packages have version numbers like 1.97.1. I can check what the version number is with

 packageVersion("data.table")

在我的电脑上返回 1.10.0.

On my computer this returns 1.10.0.

我想要做的是检查 data.table 版本是否比 1.9.7 新，因为 1.9.7 之后的版本具有我的代码需要的功能.我尝试将版本拆分为其组成部分并以不同的方式评估它们，但我还没有想出任何可靠的方法来做到这一点.非常感谢任何建议.

What I want to do is check whether the data.table version is newer than say 1.9.7 because versions after 1.9.7 have a feature that my code needs. I've tried splitting the version into its constituent parts and evaluating them in different ways but I haven't figured out any robust way of doing this. Any advice greatly appreciated.

推荐答案

虽然 utils::compareVersion() 很好，但我会说使用 packageVersion() 和比较运算符(如注释中的@G5W 所示)更简单:

While utils::compareVersion() is fine, I would say that using packageVersion() with comparison operators (as indicated by @G5W in comments) is simpler:

packageVersion("data.table")
[1] ‘1.10.0’
> packageVersion("data.table")>"1.9.8"
[1] TRUE
> packageVersion("data.table")>"1.10.01"
[1] FALSE
> packageVersion("data.table")=="1.10.0"
[1] TRUE

这在 ?packageVersion 的示例中进行了说明；?package_version 中明确记录了以这种方式使用比较运算符的能力:

This is illustrated in the examples for ?packageVersion; the ability to use comparison operators in this way is explicitly documented in ?package_version:

函数 numeric_version、package_version 和R_system_version 从这样的字符串创建一个表示(如果适合)允许强制和测试，组合，比较、摘要(最小值/最大值)、包含在数据框中，下标和打印.这些类可以持有这样的向量表示.

Functions numeric_version, package_version and R_system_version create a representation from such strings (if suitable) which allows for coercion and testing, combination, comparison, summaries (min/max), inclusion in data frames, subscripting, and printing. The classes can hold a vector of such representations.

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