R Under development (unstable) (2024-09-15 r87152 ucrt) -- "Unsuffered Consequences"
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> library(supc)
> supc:::.set_num_threads(2)
> # test get_sorted_index
> 
> r <- supc:::.get_sorted_index(1:10)
> stopifnot(isTRUE(all.equal(r, 0:9)))
> 
> r <- supc:::.get_sorted_index(10:1)
> stopifnot(isTRUE(all.equal(r, 9:0)))
> 
> r <- supc:::.get_sorted_index(c(1, 3, 2, 4, 0, -1))
> stopifnot(isTRUE(all.equal(r, c(5, 4, 0, 2, 1, 3))))
> 
> r <- supc:::.get_sorted_index(c(1, 1, 2, 2))
> stopifnot(isTRUE(all.equal(r, c(0, 1, 2, 3))))
> 
> r <- supc:::.get_sorted_index(c(2, 1, 1, 1))
> stopifnot(isTRUE(all.equal(r, c(1, 2, 3, 0))))
> 
> r <- supc:::.get_sorted_index(numeric(0))
> stopifnot(isTRUE(all.equal(r, integer(0))))
> 
> # test get_inverted_index_for_sorted_index
> 
> r <- supc:::.get_inverted_index_for_sorted_index(0:9)
> stopifnot(isTRUE(all.equal(r, 0:9)))
> 
> r <- supc:::.get_inverted_index_for_sorted_index(9:0)
> stopifnot(isTRUE(all.equal(r, 9:0)))
> 
> r <- supc:::.get_inverted_index_for_sorted_index(c(5, 4, 0, 2, 1, 3))
> stopifnot(isTRUE(all.equal(r, c(2, 4, 3, 5, 1, 0))))
> 
> r <- supc:::.get_inverted_index_for_sorted_index(c(1, 2, 3, 0))
> stopifnot(isTRUE(all.equal(r, c(3, 0, 1, 2))))
> 
> r <- supc:::.get_inverted_index_for_sorted_index(integer(0))
> stopifnot(isTRUE(all.equal(r, integer(0))))
> 
> 
> proc.time()
   user  system elapsed 
   0.18    0.07    0.25