Question

I’m feeling really dumb for asking this, but: is there an existing function in one of the more common packages which returns both the sorted data and a vector of the source indices? It’s simple enough to write:

Rgames> foo <- sample(1:10,10)
Rgames> bar <- sort(foo)
Rgames> bar_index <- sapply(1:10,function(jj)which(foo==bar[jj]))

“They call me Stormy^H^H^H^H^Htupid Monday,”

Answer 1

You could obtain the indices easily with:

match(bar, foo)

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This command will return a list including both indices and sorted data:

list(o <- order(foo), foo[o])