R Under development (unstable) (2023-11-16 r85542 ucrt) -- "Unsuffered Consequences"
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> library("R.utils")
Loading required package: R.oo
Loading required package: R.methodsS3
R.methodsS3 v1.8.2 (2022-06-13 22:00:14 UTC) successfully loaded. See ?R.methodsS3 for help.
R.oo v1.25.0 (2022-06-12 02:20:02 UTC) successfully loaded. See ?R.oo for help.

Attaching package: 'R.oo'

The following object is masked from 'package:R.methodsS3':

    throw

The following objects are masked from 'package:methods':

    getClasses, getMethods

The following objects are masked from 'package:base':

    attach, detach, load, save

R.utils v2.12.3 successfully loaded. See ?R.utils for help.

Attaching package: 'R.utils'

The following object is masked from 'package:utils':

    timestamp

The following objects are masked from 'package:base':

    cat, commandArgs, getOption, isOpen, nullfile, parse, warnings

> 
> df <- dataFrame(colClasses=c(a="integer", b="double"), nrow=10)
> df[,1] <- sample(1:nrow(df))
> df[,2] <- rnorm(nrow(df))
> print(df)
    a          b
1   5 -0.5076717
2   1  0.4148983
3   9 -0.2496892
4   7  0.6884552
5   4 -0.6976975
6   2 -0.5937149
7   8 -0.4345639
8  10 -2.2024392
9   3  0.6621096
10  6  0.5697922
> 
> proc.time()
   user  system elapsed 
   0.28    0.06    0.32