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Stable Sort algorithm [message #61477]

Thu, 20 February 2025 17:01

forlano
Messages: 1237
Registered: March 2006
Location: Italy

Senior Contributor

Hello,

do we have in core a STABLE fast sort algorithm?

Thanks,
Luigi

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Re: Stable Sort algorithm [message #61478 is a reply to message #61477]

Thu, 20 February 2025 17:24

koldo
Messages: 3459
Registered: August 2008

Senior Veteran

In https://www.ultimatepp.org/srcdoc$Core$Tutorial$en-us.html it appears this:
index.php?t=getfile&id=7048&private=0

Attachment: firefox_0JTROk3tWL.png
(Size: 26.14KB, Downloaded 381 times)

Best regards
Iñaki

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Re: Stable Sort algorithm [message #61583 is a reply to message #61477]

Thu, 20 March 2025 07:28

JeyCi
Messages: 69
Registered: July 2020

Member

can just advise to use COM-dll from bedvit (if it will connect to Upp)
1. ArraySort (String)
2. ArraySort (Variant)

Best regards.

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Re: Stable Sort algorithm [message #61590 is a reply to message #61477]

Thu, 20 March 2025 19:48

Didier
Messages: 740
Registered: November 2008
Location: France

Contributor

Recently I had challenged sort algorithms: Upp, Std, other ...And Upp sorts were the fastest Smile

(at least for my use-case)

If you want to transform an unstable alogrithm into stable one, you just need to add data index comparison in you're comparison criteria.
I tried it with Upp sort, and it was faster than stable sort Question

(for my use case were there where the comparison criteria was quite complex)

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Re: Stable Sort algorithm [message #61617 is a reply to message #61590]

Mon, 24 March 2025 22:05

JeyCi
Messages: 69
Registered: July 2020

Member

Didier wrote on Thu, 20 March 2025 19:48

If you want to transform an unstable alogrithm into stable one, you just need to add data index comparison in you're comparison criteria.

as I remember, he took comparator from here. He is developing COM and uses sorting of pointers to memory - that is considered to be faster, but as Iknow, UPP IDE also works with stack and heap directly in its source-files, just hiding pointers to Core and other packages.

Best regards.

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Re: Stable Sort algorithm [message #61651 is a reply to message #61590]

Fri, 18 April 2025 14:19

mirek
Messages: 14291
Registered: November 2005

Ultimate Member

Didier wrote on Thu, 20 March 2025 19:48

Recently I had challenged sort algorithms: Upp, Std, other ...And Upp sorts were the fastest (at least for my use-case)

It is possible they are not faster in general case - they are tuned to sort Upp::String - which usually is the use-case.

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Re: Stable Sort algorithm [message #61657 is a reply to message #61651]

Sun, 20 April 2025 19:50

Didier
Messages: 740
Registered: November 2008
Location: France

Contributor

Maybe my use case is close to that:
Sort an array of int based on sort criterias comming from data pointed by the index: sounds pretty close to sorting strings

If m'y memory is good, the upp::sort was 2 times faster than std::sort

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