R Under development (unstable) (2025-02-23 r87804 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 v1.27.0 (2024-11-01 18:00:02 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 v2.13.0 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, use, 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   3  0.76170073
2   6 -0.70524946
3   4 -1.10794566
4  10  0.49849598
5   1  1.02007394
6   9  0.94244982
7   8 -0.01778659
8   7 -0.34779326
9   2 -1.42133907
10  5 -0.10151842
> 
> proc.time()
   user  system elapsed 
   0.18    0.03    0.20