Deleting specific rows from a data frame

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  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. Drop data frame columns by name
  5. Convert data.frame columns from factors to characters
  6. Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
  7. Select the first row by group
  8. Calculate the mean of every 13 rows in data frame
  9. Calculate row means on subset of columns
  10. How does one reorder columns in a data frame?
  11. R spreading multiple columns with tidyr [duplicate]
  12. Unlist data frame column preserving information from other column
  13. Create a data.frame where a column is a list
  14. Take random sample by group
  15. How do I delete rows in a data frame?
  16. Replacing values from a column using a condition in R
  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. Remove columns from dataframe where some of values are NA
  21. Check whether values in one data frame column exist in a second data frame
  22. How do you remove columns from a data.frame?
  23. Unlist a data frame by rows, not columns
  24. Deleting columns from a data.frame where NA is more than 15% of the column length [duplicate]
  25. DT[!(x == .)] and DT[x != .] treat NA in x inconsistently
  26. Return df with a columns values that occur more than once [duplicate]
  27. Find columns with all missing values
  28. How to transpose a dataframe in tidyverse?
  29. Replace specific values based on another dataframe
  30. How to convert certain columns only to numeric?

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