Unordered combinations of all lengths

by

You could apply a sequence the length of x over the m argument of the combn() function.

x <- c("red", "blue", "black")
do.call(c, lapply(seq_along(x), combn, x = x, simplify = FALSE))
# [[1]]
# [1] "red"
# 
# [[2]]
# [1] "blue"
# 
# [[3]]
# [1] "black"
# 
# [[4]]
# [1] "red"  "blue"
# 
# [[5]]
# [1] "red"   "black"
# 
# [[6]]
# [1] "blue"  "black"
# 
# [[7]]
# [1] "red"   "blue"  "black"

If you prefer a matrix result, then you can apply stringi::stri_list2matrix() to the list above.

stringi::stri_list2matrix(
    do.call(c, lapply(seq_along(x), combn, x = x, simplify = FALSE)),
    byrow = TRUE
)
#      [,1]    [,2]    [,3]   
# [1,] "red"   NA      NA     
# [2,] "blue"  NA      NA     
# [3,] "black" NA      NA     
# [4,] "red"   "blue"  NA     
# [5,] "red"   "black" NA     
# [6,] "blue"  "black" NA     
# [7,] "red"   "blue"  "black"

More Related Contents:

  1. Removing duplicate combinations (irrespective of order)
  2. How to generate permutations or combinations of object in R?
  3. Generate list of all possible combinations of elements of vector
  4. Table of Interactions – Case with pets and houses
  5. Faster version of combn
  6. How to calculate combination and permutation in R?
  7. Non-redundant version of expand.grid
  8. Combinations by group in R
  9. Combinations of multiple vectors in R
  10. Find indices of duplicated rows [duplicate]
  11. Reshape multiple values at once
  12. Concatenate strings by group with dplyr [duplicate]
  13. Convert integer to class Date
  14. How to uninstall R and RStudio with all packages, settings and everything else?
  15. Extracting unique numbers from string in R
  16. if/else constructs inside and outside functions
  17. Adding new columns to a data.table by-reference within a function not always working
  18. Extract names of objects from list
  19. double integral in R
  20. Add a horizontal line to plot and legend in ggplot2
  21. R’s read.csv prepending 1st column name with junk text [duplicate]
  22. How to use subscripts in ggplot2 legends [R]
  23. ggplot2 – The unit of size
  24. Can dcast be used without an aggregate function? [duplicate]
  25. How to embed an image in a cell a table using DT, R and Shiny
  26. Replace missing values (NA) in one data set with values from another where columns match
  27. Implementation of Permutation, Combinations and PowerSet in C++ [duplicate]
  28. Linking Intel’s Math Kernel Library (MKL) to R on Windows
  29. How to grep a word exactly
  30. Make a rectangular legend, with rows and columns labeled, in grid

Leave a Comment