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

[Avi Gross]

Stefan,

I did not replicate your results as it works fine and applying the order result in a sorted properly result:

c(0.6,
  0.5,
  0.3,
  0.2,
  0.1,
  0.1)[order(c(0.6,
               0.5,
               0.3,
               0.2,
               0.1,
               0.1))]

[1] 0.1 0.1 0.2 0.3 0.5 0.6

I am using a more recent version of R, but for something this basic, it should not matter as even older versions should do this fine. 

R version 4.1.2 (2021-11-01) -- "Bird Hippie"
Copyright (C) 2021 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)

Consider restarting your R cleanly with no variables in place before reporting an error. 

-----Original Message-----
From: Stefan Fleck <stefan.b.fleck using gmail.com>
To: r-help using r-project.org
Sent: Sun, Jan 30, 2022 4:16 am
Subject: [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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