如何获得R语言中安装的所有软件包的列表？
A: installed.packages()
B: install.packages()
C: installed()
D: packages()
A: installed.packages()
B: install.packages()
C: installed()
D: packages()
举一反三
- 如何查看R中已经安装的所有软件包的信息？ A: install.packages() B: library(package) C: installed.packages() D: package.list()
- 安装DHCP服务的命令正确的是（ ）。 A: pm -ivh /mnt/centos/Packages/dhcp B: pm -ivh /mnt/centos/Packages/dhcp-4.2.5-47el7.x86_64.rpm C: pm -Uvh /mnt/centos/Packages/dhcp-4.2.5-47el7.x86_64.rpm D: pm -y install dhcp
- It was found upon examination that nearly 20% of the____has been broken, obviously due to improper____. A: packing, packages B: packages, packing C: packing, packing D: packages, packages
- 在Linux安装光盘中，软件包文件通常位于（ ）目录中 A: tar B: Packages C: bag D: lib
- 已知光盘已经挂载目录/mnt/cdrom内，请问如要在光盘上安装软件PPP的命令是（） A: rpm -ivh /mnt/cdrom/Packages/PPP.rpm B: rpm -ivh /mnt/cdrom/PPP-2.4.5-33.el7.x86_64.rpm C: rpm -ivh /mnt/cdrom/Packages/PPP-2.4.5-33.el7.x86_64.rpm D: rpm -vh /mnt/cdrom/Packages/PPP-2.4.5-33.el7.x86_64.rpm