summary
dplyr
library(dplyr)
base::reshape
library(reshape2)
reshape2
library(tidyr)
duplicated
unique
is.na
na.omit
complete.cases
base::merge
merge
join
sqldf
NA
write.table
write.csv
writeLines
?write.table write.table(x, file = "", append = FALSE, quote = TRUE, sep = " ", eol = "\n", na = "NA", dec = ".", row.names = TRUE, col.names = TRUE, qmethod = c("escape", "double"), fileEncoding = "") write.csv(...)