irep: Add simulation counter

In xpose.xtras: Extra Functionality for the 'xpose' Package

Add simulation counter

Description

Add a column containing a simulation counter (irep). A new simulation is counted every time a value in x is different than its previous value and is a duplicate.

xpose fixed this upstream around version 0.5.0, then later reverted that fix, so this is treated as a standing bugfix rather than a temporary one pending removal (previously this deferred to xpose::irep() for xpose >= 0.5.0; that's no longer safe to assume).

This version of the function does not require IDs be ascending, but does not work for datasets where IDs are repeated (not in sequence). Both cases are read as separate individuals for NONMEM, but NONMEM does not need to detect repetition of ID sequences (for NONMEM, 1,1,2,2,3,3,1,1,2,2,3,3 is 6 individuals, regardless of being 2 repeats of 3 individuals). Given the vast majority of datasets use 1 individual per ID, (which cannot be said about IDs always being ascending), only one of these corrections is implemented.

Usage

irep(x, quiet = FALSE)

Arguments

x	The column to be used for computing simulation number, usually the ID column.
quiet	Logical, if FALSE messages are printed to the console.

Details

Bugfix for irep.

Value

⁠<numeric>⁠ vector tracking the number of simulations based on unique subject IDs.

Examples

data("xpdb_ex_pk", package = "xpose")

xpdb_ex_pk_2 <- xpdb_ex_pk %>%
 mutate(sim_id = irep(ID), .problem = 2)

xpose.xtras documentation built on Sept. 1, 2026, 5:08 p.m.