[R] [External] Weird behaviour of order() when having multiple ties

[Richard M. Heiberger]

when there are ties it doesn't matter which is first.
in a situation where it does matter, you will need a tiebreaker column.
________________________________
From: R-help <r-help-bounces using r-project.org> on behalf of Stefan Fleck <stefan.b.fleck using gmail.com>
Sent: Sunday, January 30, 2022 4:16:44 AM
To: r-help using r-project.org <r-help using r-project.org>
Subject: [External] [R] Weird behaviour of order() when having multiple ties

I am experiencing a weird behavior of `order()` for numeric vectors. I
tested on 3.6.2 and 4.1.2 for windows and R 4.0.2 on ubuntu. Can anyone
confirm?

order(
  c(
    0.6,
    0.5,
    0.3,
    0.2,
    0.1,
    0.1
  )
)
## Result [should be in order]
[1] 5 6 4 3 2 1

The sort order is obviously wrong. This only occurs if i have multiple
ties. The problem does _not_ occur for decreasing = TRUE.

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and provide commented, minimal, self-contained, reproducible code.

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