as_integer_if_safe: Coerce from double to integer if safe

In hutilscpp: Miscellaneous Functions in C++

Coerce from double to integer if safe

Description

The same as as.integer(x) but only if x consists only of whole numbers and is within the range of integers.

Usage

as_integer_if_safe(x)

Arguments

x	A double vector. If not a double vector, it is simply returned without any coercion.

Examples

N <- 1e6  # run with 1e9
x <- rep_len(as.double(sample.int(100)), N)
alt_as_integer <- function(x) {
  xi <- as.integer(x)
  if (isTRUE(all.equal(x, xi))) {
    xi
  } else {
    x
  }
}
bench_system_time(as_integer_if_safe(x))
#> process    real
#>  6.453s  6.452s
bench_system_time(alt_as_integer(x))
#> process    real
#> 15.516s 15.545s
bench_system_time(as.integer(x))
#> process    real
#>  2.469s  2.455s

hutilscpp documentation built on Oct. 11, 2023, 9:06 a.m.