RobertMyles

library(ggplot2)
library(scales)
library(tidyr)
library(dplyr)
rm(list=ls())
df <- structure(list(Animal = structure(c(2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 1L, 1L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 3L), 
                  .Label = c("Buffalo", "Goat", "Sheep"), 
                  class = "factor"), 
                  Texture = structure(c(4L, 4L, 4L, 4L, 4L, 3L, 3L, 3L, 2L, 1L, 1L, 4L, 3L, 4L, 2L, 2L, 2L, 2L, 1L, 1L, 1L, 1L), 
                  .Label = c("Hard", "Semi-Hard", "Semi-Soft", "Soft"), 

RobertMyles

# library() or require() only load one package at a time
# but...

Packages <- c("dplyr", "ggplot2", "rstan", "readr")

lapply(Packages, library, character.only = TRUE)

# this loads as many as you put in 'Packages'. They need to be installed first, of course.

RobertMyles

Old_packList <- as.list(installed.packages("/Library/Frameworks/R.framework/Versions/3.2/Resources/library"))
# here, my R version was 3.2. Change it for the R version you want the packages from!
Old <- as.character(Old_packList)
install.packages(Old)