How to melt and cast dataframes using dplyr?

Question

Recently I am doing all my data manipulations using dplyr and it is an excellent tool for that. However I am unable to melt or cast a data frame using dplyr. Is there any way to

Answer 1

In addition, cast can be using tidyr::spread()

Example for you

library(reshape2)
library(tidyr)
library(dplyr)

# example data : `mini_iris`
(mini_iris <- iris[c(1, 51, 101), ])

# melt
(melted1 <- mini_iris %>% melt(id.vars = "Species"))         # on reshape2
(melted2 <- mini_iris %>% gather(variable, value, -Species)) # on tidyr

# cast
melted1 %>% dcast(Species ~ variable, value.var = "value") # on reshape2
melted2 %>% spread(variable, value)                        # on tidyr