Listed below are codes for some data frame operations that are good to have at your fingertips:
- Create an empty data.frame
- Sort a dataframe by column(s)
- Merge/Join data frames (inner, outer, left, right)
- Drop data frame columns by name
- Remove rows with NAs in data.frame
- Quickly reading very large tables as dataframes in R
- Drop factor levels in a subsetted data frame
- Convert R list to data frame
- Convert data.frame columns from factors to characters
- Extracting specific columns from a data frame
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