readRDS()时，无法读取

请问这个是怎么回事？ > install.packages("gdata") 试开URL’https://cran.rstudio.com/bin/macosx/contrib/4.2/gdata_2.18.0.1.tgz' Content type 'application/x-gzip' length 1220241 bytes (1.2 MB) ================================================== downloaded 1.2 MB 下载的二进制程序包在 /var/folders/_1/9ts2x2vd3cjf5whfzkfkdh_c0000gn/T//RtmpaWy9ym/downloaded_packages里 > library("gdata") gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED. gdata: read.xls support for 'XLSX' (Excel 2007+) files ENABLED. 载入程辑包：‘gdata’ The following object is masked from ‘package:stats’: nobs The following object is masked from ‘package:utils’: object.size The following object is masked from ‘package:base’: startsWith

我用rstudio为何有些包能自动下载，有些不行呢

各位老师和小伙伴好，我在执行summary(example1)时，Name和Region均只显示了长度和数据类型，没有显示具体的各个结果的频数统计，如Apple 1， Blueberry 1。请问这是为什么，与我的Name和Region数据类型为chr有关吗？

运行：install("gdata") 后，显示： install.packages("gdata") Warning in install.packages : unable to access index for repository https://cran.rstudio.com/src/contrib: cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES' 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/ Warning in install.packages : unable to access index for repository https://cran.rstudio.com/src/contrib: cannot open URL 'https://cran.rstudio.com/src/contrib/PACKAGES' Warning in install.packages : package ‘gdata’ is not available for this version of R A version of this package for your version of R might be available elsewhere, see the ideas at https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages Warning in install.packages : unable to access index for repository https://cran.rstudio.com/bin/windows/contrib/4.1: cannot open URL 'https://cran.rstudio.com/bin/windows/contrib/4.1/PACKAGES' 怎们弄哇？是版本不对吗？

我想请教一下，跑完了之后电脑突然自动关机了，还能找到跑完的文件吗？

Error in findPerl(verbose = verbose) : perl executable not found. Use perl= argument to specify the correct path. Error in file.exists(tfn) : 'file'参数不对

如何将数据框保存为Excel格式

install.packages('xlsx')后 library(xlsx) 显示 错误: package or namespace load failed for ‘xlsx’: loadNamespace()里算'rJava'时.onLoad失败了，详细内容： 调用: fun(libname, pkgname) 错误: JAVA_HOME cannot be determined from the Registry 此外: Warning message: 程辑包‘xlsx’是用R版本4.0.4 来建造的 要怎么解决呢

路径是中文就不能读取吗？