尝试在macOS Catalatina,上的RStudio内安装程序包时失败，并出现Permission Denied错误：
> install.packages("mlbench")
trying URL 'https://cran.rstudio.com/src/contrib/mlbench_2.1-1.tar.gz'
Content type 'application/x-gzip' length 920768 bytes (899 KB)
==================================================
downloaded 899 KB
* installing *source* package ‘mlbench’ ...
** package ‘mlbench’ successfully unpacked and MD5 sums checked
mv: rename /usr/local/Cellar/r/3.6.1_1/lib/R/library/mlbench to /usr/local/Cellar/r/3.6.1_1/lib/R/library/00LOCK-mlbench/mlbench: Permission denied
ERROR: cannot remove earlier installation, is it in use?
* removing ‘/usr/local/Cellar/r/3.6.1_1/lib/R/library/mlbench’
Warning in install.packages :
installation of package ‘mlbench’ had non-zero exit status
The downloaded source packages are in
‘/private/var/folders/bc/wsz930gj3gn5zgq4hbm6jkfr0000gn/T/RtmpdvQLox/downloaded_packages’
Updating HTML index of packages in '.Library'
Warning in install.packages :
cannot create file '/usr/local/Cellar/r/3.6.1_1/lib/R/doc/html/packages.html', reason 'Permission denied'
Warning in install.packages :
cannot update HTML package index
如RStudio支持所述：
您能在R中安装软件包吗
如果您遇到问题，我们建议您尝试在R中安装软件包(在RStudio之外(，看看你是否能够做到这一点。如果没有，请请检查以下可能的解决方案。
因此，需要：
- 切换到CCD_ 4
- 在您的终端内，您的R控制台必须以
sudo权限启动。否则，它将再次失败，并出现拒绝权限错误。因此，在您的终端中，键入sudo R - 然后安装任何必要的软件包：例如
install.packages("mlbench")