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Add sub index within group
add_group_sub(df, group, sep = "_", tmp_col = "tmp_col")
A dataframe.
A string or string vector. When vector, the first string will be used for adding sub index.
A string for separator.
A string of colnames for temporary use.
library(dplyr) add_group_sub(mtcars, c("am", "gear")) add_group_sub(mtcars, c("cyl", "am"))
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