How to swap values between two columns

by

Try this

 df <- data.frame(V1=c(1,2,4), V2=c("a","a","b"), V3=c(2,3,1))
 df[df$V2 == "b", c("V1", "V3")] <- df[df$V2 == "b", c("V3", "V1")]

which yields:

> df
  V1 V2 V3
1  1  a  2
2  2  a  3
3  1  b  4

More Related Contents:

  1. Repeat each row of data.frame the number of times specified in a column
  2. Filter data.frame rows by a logical condition
  3. Split column at delimiter in data frame [duplicate]
  4. Pass a data.frame column name to a function
  5. How to convert a list consisting of vector of different lengths to a usable data frame in R?
  6. Select groups based on number of unique / distinct values
  7. Assign multiple columns using := in data.table, by group
  8. Filtering a data frame on a vector [duplicate]
  9. Remove an entire column from a data.frame in R
  10. Split dataframe into multiple output files
  11. How do I delete rows in a data frame?
  12. Convert data.frame column to a vector?
  13. Add new row to dataframe, at specific row-index, not appended?
  14. How to use a string variable to select a data frame column using $ notation [duplicate]
  15. Growing a data.frame in a memory-efficient manner
  16. R list of lists to data.frame
  17. Splitting a data.frame by a variable [duplicate]
  18. Check whether values in one data frame column exist in a second data frame
  19. Unlist a data frame by rows, not columns
  20. Deleting columns from a data.frame where NA is more than 15% of the column length [duplicate]
  21. Using lapply to apply a function over list of data frames and saving output to files with different names
  22. DT[!(x == .)] and DT[x != .] treat NA in x inconsistently
  23. Return df with a columns values that occur more than once [duplicate]
  24. Row-wise sum of values grouped by columns with same name
  25. Replicate each row of data.frame and specify the number of replications for each row?
  26. Undefined columns selected when subsetting data frame
  27. Difference between `names(df[1])
  28. How to create a new variable in a data.frame based on a condition?
  29. Data.frame Merge and Selection of values which are common in 2 Data.frames
  30. Interpolating timeseries

Leave a Comment