How to add new column to an dataframe (to the front not end)?

by

More Related Contents:

  1. Aggregate / summarize multiple variables per group (e.g. sum, mean)
  2. Sort (order) data frame rows by multiple columns
  3. Subset data frame based on number of rows per group
  4. Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
  5. R Reshape data frame from long to wide format? [duplicate]
  6. Sum rows in data.frame or matrix
  7. Select the first row by group
  8. Calculate the mean of every 13 rows in data frame
  9. Select the first and last row by group in a data frame
  10. How does one reorder columns in a data frame?
  11. Update data frame via function doesn’t work
  12. Create a data.frame where a column is a list
  13. How to quickly form groups (quartiles, deciles, etc) by ordering column(s) in a data frame
  14. Take random sample by group
  15. Split dataframe into multiple output files
  16. How do I delete rows in a data frame?
  17. Split data.frame by value
  18. Convert data.frame column to a vector?
  19. Add new row to dataframe, at specific row-index, not appended?
  20. How to use a string variable to select a data frame column using $ notation [duplicate]
  21. Growing a data.frame in a memory-efficient manner
  22. R list of lists to data.frame
  23. Splitting a data.frame by a variable [duplicate]
  24. Unlist a data frame by rows, not columns
  25. Using lapply to apply a function over list of data frames and saving output to files with different names
  26. write.csv for large data.table
  27. Count unique values for every column
  28. Divide each value by the sum of values by group
  29. Convert all data frame character columns to factors
  30. What you can do with a data.frame that you can’t with a data.table?

Leave a Comment