combs: All Combinations of k Elements from Vector v
Description
Finds all unordered combinations of k elements from vector
v.
Usage
combs(v,k)
Arguments
Value
combs(v,k) (where v has length n) creates a matrix with
$\frac{n!}{(n-k)! k!}$ (n choose k) rows
and k columns containing all possible combinations of n elements
taken k at a time.
See Also
I discovered recently that R packages already have two functions with
similar capabilities:
combinations from gTools package and
Also similar to Matlab's nchoosek function (http://www.mathworks.com/access/helpdesk/help/techdoc/ref/nchoosek.html)