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Showing content from https://github.com/jwood000/RcppAlgos/issues/11 below:

permuteGeneral alters source vector · Issue #11 · jwood000/RcppAlgos · GitHub

After passing a source vector from a dataframe to permuteGeneral, the source dataframe is altered.

# compare mydf before and after running permuteGeneral
> name <- c('first', 'second', 'third')
> rank <- c('1st', '2nd', '3rd')
> mydf <- data.frame(name, rank, stringsAsFactors = FALSE)

> mydf
    name rank
1  first  1st
2 second  2nd
3  third  3rd

> permutations <- permuteGeneral(mydf[,"name"], 3)

> mydf
    name rank
1  third  1st
2  first  2nd
3 second  3rd

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