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Install and load multiple R packages at once
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# ipak function: install and load multiple R packages. | |
# check to see if packages are installed. Install them if they are not, then load them into the R session. | |
ipak <- function(pkg){ | |
new.pkg <- pkg[!(pkg %in% installed.packages()[, "Package"])] | |
if (length(new.pkg)) | |
install.packages(new.pkg, dependencies = TRUE) | |
sapply(pkg, require, character.only = TRUE) | |
} | |
# usage | |
packages <- c("ggplot2", "plyr", "reshape2", "RColorBrewer", "scales", "grid") | |
ipak(packages) |
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