pepper | R Documentation |
Given a list of variables, construct every term comprising only those
variables; function pepper()
returns a free algebra object
equal to the sum of these terms.
The function is named for a query from an exam question set by Sarah
Marshall in which she asked how many ways there are to arrange the
letters of word “pepper”, the answer being \left({6\atop
1\,2\,3}\right)=\frac{6!}{1!2!3!}=60
.
Function multiset()
in the partitions
package gives
related functionality.
pepper(v)
v |
Variables to combine. If a character string, coerce to variable numbers |
Robin K. S. Hankin
linear
pepper(c(1,2,2,2,3))
pepper("pepper")
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