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r - 安装 xfun 的问题（对于 rmarkdown）

问题描述

我正在为 Rstudio 的完全新手编写 Rstudio 教程。要使用 learnr 运行教程，学生需要安装 learnr 和 rmarkdown。但是我遇到了 xfun 的问题，它是 rmarkdown 的依赖项之一。安装 xfun 给了我一个旧版本 (0.22)，但安装 tinytex 和 rmarkdown 需要更高版本 (>=0.23)。我现在已经在几台装有最新版本 R 的 Windows 计算机上尝试过这个，并且遇到了同样的问题。

解决方法：在我自己的计算机上，我下载了 xfun 源代码的 .zip 文件，并通过转到工具 -> 安装包手动将其安装到 RStudio... 但是，这似乎太复杂，无法引导学生完成开始基础教程。

有谁知道一种轻松（用一两行代码）强制 R 安装最新版本的 xfun 的方法？我希望能够让我的学生将命令复制到 R 中，以便他们可以安装必要的软件包并运行 rmarkdown/learnr 教程。

这是我尝试安装学习器时得到的输出：

> install.packages("learnr")
WARNING: Rtools is required to build R packages but is not currently installed. Please download and install the appropriate version of Rtools before proceeding:

https://cran.rstudio.com/bin/windows/Rtools/
Installing package into ‘C:/Users/kyrad/OneDrive/Documents/R/win-library/3.6’
(as ‘lib’ is unspecified)
also installing the dependencies ‘tinytex’, ‘xfun’, ‘rmarkdown’


  There are binary versions available but the
  source versions are later:
          binary source needs_compilation
tinytex     0.31   0.34             FALSE
xfun        0.22   0.26              TRUE
rmarkdown    2.8   2.11             FALSE

  Binaries will be installed
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.6/xfun_0.22.zip'
Content type 'application/zip' length 323923 bytes (316 KB)
downloaded 316 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.6/learnr_0.10.1.zip'
Content type 'application/zip' length 1661500 bytes (1.6 MB)
downloaded 1.6 MB

package ‘xfun’ successfully unpacked and MD5 sums checked
package ‘learnr’ successfully unpacked and MD5 sums checked

The downloaded binary packages are in
    C:\Users\kyrad\AppData\Local\Temp\Rtmpmwhs1M\downloaded_packages
installing the source packages ‘tinytex’, ‘rmarkdown’

trying URL 'https://cran.rstudio.com/src/contrib/tinytex_0.34.tar.gz'
Content type 'application/x-gzip' length 30196 bytes (29 KB)
downloaded 29 KB

trying URL 'https://cran.rstudio.com/src/contrib/rmarkdown_2.11.tar.gz'
Content type 'application/x-gzip' length 3212367 bytes (3.1 MB)
downloaded 3.1 MB

* installing *source* package 'tinytex' ...
** package 'tinytex' successfully unpacked and MD5 sums checked
** using staged installation
** R
** inst
** byte-compile and prepare package for lazy loading
Error in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : 
  namespace 'xfun' 0.22 is being loaded, but >= 0.23 is required
Calls: <Anonymous> ... namespaceImportFrom -> asNamespace -> loadNamespace
Execution halted
ERROR: lazy loading failed for package 'tinytex'
* removing 'C:/Users/kyrad/OneDrive/Documents/R/win-library/3.6/tinytex'
Warning in install.packages :
  installation of package ‘tinytex’ had non-zero exit status
ERROR: dependency 'tinytex' is not available for package 'rmarkdown'
* removing 'C:/Users/kyrad/OneDrive/Documents/R/win-library/3.6/rmarkdown'
Warning in install.packages :
  installation of package ‘rmarkdown’ had non-zero exit status

The downloaded source packages are in
    ‘C:\Users\kyrad\AppData\Local\Temp\Rtmpmwhs1M\downloaded_packages’

标签： rr-markdowninstall.packages

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