R软件包安装在2个不同的位置 [英] R package installed in 2 different locations

问题描述

我在2个位置安装了R软件包 ape ，它们都是 .libPath()
的一部分-location1中的 ape 版本3.3
-location2中的 ape 版本3.4

I have R package ape installed in 2 locations, that are BOTH part of the .libPath()
- ape version 3.3 in location1
- ape version 3.4 in location2

在 ape 版本3.4中，有一个新函数 clustalomega .我尚未加载2个软件包中的任何一个(使用 library )

in ape version 3.4, there is a new function clustalomega. I have NOT loaded any of the 2 packages (using library)

ape :: clustalomega 在我的计算机上不起作用.我怀疑这是因为R首先考虑了它在location1中发现的 ape 的旧版本.

ape::clustalomega doesn't work on my machine. I suspect it comes from the fact that R is considering first the old version of ape it has found in location1.

我尝试使用 .libPath(rev(.libPath())颠倒libPath的顺序，但是它没有任何改变.

I have tried to reverse the order of the libPath, with .libPath(rev(.libPath()) but it didn't change anything.

有没有办法确保我们从位置2优先处理该软件包(我无法控制位置1上安装的内容)

Is there a way to ensure we take the package in priority from location 2 (I have no control on what is installed on location1)

推荐答案

解决方案在于函数 unloadNamespace .看起来，当R启动时，即使它没有加载 library("ape")，它仍会从第一个lib.loc找到该包的名称空间(在这种情况下，，位置1)

The solution lies with function unloadNamespace. It seems that when R is starting, eventhough it is not loading the library("ape"), it still loads the namespace of the package, from the first lib.loc it can find (in this case, location1)

因此，为了强制从另一个位置加载名称空间，我们需要这样做:

So in order to force the loading of the namespace from another location, we need to do:

ape :: clustalomega#不存在
'ape'％in％loadNamespaces()#返回TRUE
unloadNamespace(ns ='ape')'ape'％in％loadNamespaces()#返回FALSEloadNamespace(package ='ape'，lib.loc = location2)

ape::clustalomega # doesn't exist
'ape' %in% loadedNamespaces() #returns TRUE
unloadNamespace(ns = 'ape') 'ape' %in% loadedNamespaces() #returns FALSE loadNamespace(package = 'ape', lib.loc = location2)

ape :: clustalomega#现在可以使用

ape::clustalomega # now works

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