如何安装库（读取器）？

Question

我很惊讶images无法突然加载：

library(readr)

所以我试过了：

library(readr)
Error in loadNamespace(j <- imp[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]) : 
  there is no package called ‘Rcpp’
In addition: Warning message:
package ‘readr’ was built under R version 3.2.2 
Error: package or namespace load failed for ‘readr’

之后，我尝试了SO：

install.packages("Rcpp") #with all dependencies
trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.2/Rcpp_0.12.1.zip'
Content type 'application/zip' length 3189720 bytes (3.0 MB)
downloaded 3.0 MB

package ‘Rcpp’ successfully unpacked and MD5 sums checked
Warning in install.packages :
cannot remove prior installation of package ‘Rcpp’

The downloaded binary packages are in
C:\Users\m\AppData\Local\Temp\RtmpMd0LfX\downloaded_packages

我错过了什么吗？

Answer 1

您使用的是Windows，尝试更新涉及已编译代码的软件包（例如readr和Rcpp）时遇到了一些问题。基本上，如果加载了这些包，则无法更新它们;并且没有办法卸载它们。因此，您需要以“vanilla”模式重新启动R（即，只加载基础包）。从命令提示符执行：

R --vanilla

然后，您应该能够安装这些包。我会尝试：

install.packages(c("Rcpp", "readr"))

你应该好好去。