Non-redundant version of expand.grid

by

How about using outer? But this particular function concatenates them into one character string.

outer( c("aa", "ab", "cc"), c("aa", "ab", "cc") , "paste" )
#     [,1]    [,2]    [,3]   
#[1,] "aa aa" "aa ab" "aa cc"
#[2,] "ab aa" "ab ab" "ab cc"
#[3,] "cc aa" "cc ab" "cc cc"

You can also use combn on the unique elements of the two vectors if you don’t want the repeating elements (e.g. aa aa)

vals <- c( c("aa", "ab", "cc"), c("aa", "ab", "cc") )
vals <- unique( vals )
combn( vals , 2 )
#     [,1] [,2] [,3]
#[1,] "aa" "aa" "ab"
#[2,] "ab" "cc" "cc"

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. Unordered combinations of all lengths
  6. Faster version of combn
  7. How to calculate combination and permutation in R?
  8. Cartesian product with dplyr
  9. Combinations by group in R
  10. Combinations of multiple vectors in R
  11. How to prevent ifelse() from turning Date objects into numeric objects
  12. Evaluate expression given as a string
  13. Split column at delimiter in data frame [duplicate]
  14. Cluster analysis in R: determine the optimal number of clusters
  15. Select groups based on number of unique / distinct values
  16. How to send an email with attachment from R in windows
  17. How to create example data set from private data (replacing variable names and levels with uninformative place holders)?
  18. R ifelse to replace values in a column
  19. finding point of intersection in R
  20. Unable to load rJava on R
  21. Merge Multiple spaces to single space; remove trailing/leading spaces
  22. Order of operator precedence when using “:” (the colon)
  23. Determining UTM zone (to convert) from longitude/latitude
  24. Using R to download zipped data file, extract, and import .csv
  25. Downloading png from Shiny (R)
  26. Layered axes in ggplot?
  27. dplyr: put count occurrences into new variable [duplicate]
  28. Calculate mean across rows with NA values in R
  29. Is it possible to jitter two ggplot geoms in the same way?
  30. in r combine a list of lists into one list

Leave a Comment