ggplot2 (>= 2.0.0), grid, jpeg, plyr, dplyr, magrittr, purrr,
reshape2
ggplot2 (>= 2.0.0), grid, jpeg, plyr, dplyr, magrittr, purrr,
reshape2, knitr
ggplot2 (>= 2.0.0), grid, jpeg, plyr, dplyr, tidyr, magrittr,
purrr, reshape2, knitr, rlang