Question

使用devtools函数时，我遇到了非常奇怪的副作用。这是一个简单的例子。基本上，我启动一个干净的R会话，创建一个空包，然后使用load_all加载新包。一旦我这样做，帮助功能就不再起作用了。这是屏幕截图：

R version 3.1.0 (2014-04-10) -- "Spring Dance"
Copyright (C) 2014 The R Foundation for Statistical Computing
Platform: i386-w64-mingw32/i386 (32-bit)

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Type 'contributors()' for more information and
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> setwd("c:/Scratch")
> require(devtools)
Loading required package: devtools

Attaching package: ‘devtools’

The following objects are masked from ‘package:utils’:

    ?, help

The following object is masked from ‘package:base’:

    system.file

> help("data.frame")
starting httpd help server ... done
> create("mypackage",rstudio=F)
Creating package mypackage in .
No DESCRIPTION found. Creating with values:

Package: mypackage
Title: What the package does (short line)
Version: 0.1
Authors@R: "First Last <first.last@example.com> [aut, cre]"
Description: What the package does (paragraph)
Depends: R (>= 3.1.0)
License: What license is it under?
LazyData: true
> help("data.frame")
> load_all("mypackage")
Loading mypackage
> help("data.frame")
Error in names(t1) <- rep(names(L), lapply(L, length)) : 
  attempt to set an attribute on NULL
>

以下是会话信息：

> sessionInfo()
R version 3.1.0 (2014-04-10)
Platform: i386-w64-mingw32/i386 (32-bit)


attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] mypackage_0.1 devtools_1.5 

loaded via a namespace (and not attached):
[1] digest_0.6.4   evaluate_0.5.5 httr_0.3       memoise_0.2.1  parallel_3.1.0 RCurl_1.95-4.1 stringr_0.6.2  tools_3.1.0    whisker_0.3-2 
>

帮助命令不起作用只是一个例子，我注意到还有其他一些奇怪的东西。像data.table子集函数不再工作。如果你能给我一些指导你如何解决问题，我将不胜感激。

Answer 1

这是devtools 1.5中的一个错误，当项目没有帮助文件时会发生这个错误。我只是推了一个修复。

在非Windows平台上，您可以使用devtools::install_github('hadley/devtools')更新到最新版本。在Windows上，有关如何更新的说明，请参阅?build_github_devtools。

如何解决devtools不必要的副作用

1 个答案: