cumsum by group [duplicate]

by 
library(data.table)

data <- data.table(group1=c('A','A','A','B','B'),sum=c(1,2,4,3,7))

data[,list(cumsum = cumsum(sum)),by=list(group1)]

More Related Contents:

  1. Calculate cumulative sum (cumsum) by group
  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 convert string rule to an expression which has a range in R [closed]
  7. How does one access the piped data.frame in dplyr::funs?
  8. Using ggplot2, can I insert a break in the axis?
  9. Installing older version of R package
  10. How to subset matrix to one column, maintain matrix data type, maintain row/column names?
  11. Filter multiple values on a string column in dplyr
  12. Fixing the order of facets in ggplot
  13. Loop in R to read many files
  14. Read all files in a folder and apply a function to each data frame
  15. Change the class from factor to numeric of many columns in a data frame
  16. Forcing garbage collection to run in R with the gc() command
  17. R: How to handle times without dates?
  18. Converting nested list to dataframe
  19. Align ggplot2 plots vertically
  20. Calculate row-wise maximum
  21. How to delete rows where all the columns are zero
  22. using parallel’s parLapply: unable to access variables within parallel code
  23. How to move or position a legend in ggplot2
  24. Transposing a dataframe maintaining the first column as heading
  25. Using get() with replacement functions
  26. Replace a value NA with the value from another column in R
  27. Insert a row in a data.table
  28. Clarification of L in R
  29. Convert integer as “20160119” to different columns of “day” “year” “month”
  30. Convert two-digit years to four-digit years with correct century

Leave a Comment