Calculate cumulative sum (cumsum) by group

by 
df$csum <- ave(df$value, df$id, FUN=cumsum)

ave is the “go-to” function if you want a by-group vector of equal length to an existing vector and it can be computed from those sub vectors alone. If you need by-group processing based on multiple “parallel” values, the base strategy is do.call(rbind, by(dfrm, grp, FUN)).

More Related Contents:

  1. cumsum by group [duplicate]
  2. Cumulative sum until maximum reached, then repeat from zero in the next row
  3. Conditional cumsum with reset
  4. Rowwise cumulative sum
  5. resetting cumsum if value goes to negative in r
  6. How to replace a value by another within a variable in R?
  7. Relative frequencies / proportions with dplyr
  8. How to add texture to fill colors in ggplot2
  9. Cleaning up factor levels (collapsing multiple levels/labels)
  10. Split a large dataframe into a list of data frames based on common value in column
  11. Save a plot in an object
  12. How to cbind or rbind different lengths vectors without repeating the elements of the shorter vectors?
  13. lapply vs for loop – Performance R
  14. calculate the mean for each column of a matrix in R
  15. Extract regression coefficient values
  16. How to plot a function curve in R
  17. How to make execution pause, sleep, wait for X seconds in R?
  18. Convert seconds to days: hours:minutes:seconds
  19. Concatenate strings and expressions in a plot’s title
  20. Counting number of instances of a condition per row R [duplicate]
  21. Create a ranking variable with dplyr?
  22. Find value corresponding to maximum in other column [duplicate]
  23. Split delimited single value character vector
  24. R split numeric vector at position
  25. Creating a Plot Window of a Particular Size
  26. R: invalid multibyte string [duplicate]
  27. Reordering factor gives different results, depending on which packages are loaded
  28. Join two data frames in R based on closest timestamp
  29. Update/Replace Values in Dataframe with Tidyverse Join
  30. Is there a way to output text to the R console in color

Leave a Comment