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

Mon Jan 31 16:07:58 CET 2022

Dat1 <- c(0.6, 0.5, 0.3, 0.2, 0.1, 0.1, 0.2)
print(order(Dat1))
print(sort(Dat1))

Compare output

-----Original Message-----
From: R-help <r-help-bounces using r-project.org> On Behalf Of Martin Maechler
Sent: Monday, January 31, 2022 9:04 AM
To: Stefan Fleck <stefan.b.fleck using gmail.com>
Cc: r-help using r-project.org
Subject: Re: [R] [External] Weird behaviour of order() when having multiple ties

[External Email]

>>>>> Stefan Fleck
>>>>>     on Sun, 30 Jan 2022 21:07:19 +0100 writes:

    > it's not about the sort order of the ties, shouldn't all the 1s in
    > order(c(2,3,4,1,1,1,1,1)) come before 2,3,4? because that's not what
    > happening

aaah.. now we are getting somewhere:
It looks you have always confused order() with sort() ...
have you ?

    > On Sun, Jan 30, 2022 at 9:00 PM Richard M. Heiberger <rmh using temple.edu> wrote:

    >> 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.
    >>
    >> [[alternative HTML version deleted]]
    >>
    >> ______________________________________________
    >> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
    >>
    >> https://urldefense.proofpoint.com/v2/url?u=https-3A__nam10.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Fstat.ethz.ch-252Fmailman-252Flistinfo-252Fr-2Dhelp-26amp-3Bdata-3D04-257C01-257Crmh-2540temple.edu-257Cbae20314c2314a5cc7cd08d9e429e33f-257C716e81efb52244738e3110bd02ccf6e5-257C0-257C0-257C637791692024451993-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-26amp-3Bsdata-3DO6R-252FNM6IdPzP8RY3JIWfLgmkE-252B0KcVyYBxoRMo8v2dk-253D-26amp-3Breserved-3D0&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=LETnyM_0QTFNEMNectANV0IJZgIOyofIv54iJDPBZF-atb3Xe9lGTZ7tN68hw3Te&s=kydE98W9Su8vCPoxYcigO1iYSHVO2pjdbYqF8z4CEwo&e=
    >> PLEASE do read the posting guide
    >> https://urldefense.proofpoint.com/v2/url?u=https-3A__nam10.safelinks.protection.outlook.com_-3Furl-3Dhttp-253A-252F-252Fwww.r-2Dproject.org-252Fposting-2Dguide.html-26amp-3Bdata-3D04-257C01-257Crmh-2540temple.edu-257Cbae20314c2314a5cc7cd08d9e429e33f-257C716e81efb52244738e3110bd02ccf6e5-257C0-257C0-257C637791692024451993-257CUnknown-257CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0-253D-257C3000-26amp-3Bsdata-3D6hlfMjZLzopVzGnFVWlGnoEqvZBQwXPlxMuZ2sglEUk-253D-26amp-3Breserved-3D0&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=LETnyM_0QTFNEMNectANV0IJZgIOyofIv54iJDPBZF-atb3Xe9lGTZ7tN68hw3Te&s=_xSJacXhmOM-JE0jBCZ62UPEgerWHVqFkW2aXuIekvY&e=
    >> and provide commented, minimal, self-contained, reproducible code.
    >>

    > [[alternative HTML version deleted]]

    > ______________________________________________
    > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
    > https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dhelp&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=LETnyM_0QTFNEMNectANV0IJZgIOyofIv54iJDPBZF-atb3Xe9lGTZ7tN68hw3Te&s=eoBL8fgGe-j3eEYAo1fT5-oVM-5twH3nn5iTJ3Dh6vc&e=
    > PLEASE do read the posting guide https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=LETnyM_0QTFNEMNectANV0IJZgIOyofIv54iJDPBZF-atb3Xe9lGTZ7tN68hw3Te&s=6QEl5w7lJHJJELW6QwypJN8KK64mDcTZXg5yoLs9Wu4&e=
    > and provide commented, minimal, self-contained, reproducible code.

______________________________________________
R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dhelp&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=LETnyM_0QTFNEMNectANV0IJZgIOyofIv54iJDPBZF-atb3Xe9lGTZ7tN68hw3Te&s=eoBL8fgGe-j3eEYAo1fT5-oVM-5twH3nn5iTJ3Dh6vc&e=
PLEASE do read the posting guide https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwICAg&c=sJ6xIWYx-zLMB3EPkvcnVg&r=9PEhQh2kVeAsRzsn7AkP-g&m=LETnyM_0QTFNEMNectANV0IJZgIOyofIv54iJDPBZF-atb3Xe9lGTZ7tN68hw3Te&s=6QEl5w7lJHJJELW6QwypJN8KK64mDcTZXg5yoLs9Wu4&e=
and provide commented, minimal, self-contained, reproducible code.