What is ODLK1?

BOINC-project ODLK1 continues to solve the problem of BOINC-project ODLK.
The project generates a database of canonical forms (CF) of diagonal Latin squares (DLS) of order 10 having orthogonal diagonal Latin squares (ODLS).
The necessary definitions for the theme can be found here:

Join ODLK1

User of the Day

User profile Profile planetclown
I enjoy following trends in science and ways they can improve humanity. Proud member of team Crunching@EVGA.

News

Internet connection restored
So, the electrical power was shout down for 3,5h on Sunday in all the municipal area and the very good news was that the UPS (that was supposed to function for one hour) lasted for all the time and it was not near to finish the power reserve.

UPS is for saving integrity of server when there is no power, not to support all the rest of network equipments.

However when the power was back there were not internet connection!

As the service provider repeater is located 200m of distance and there were no workers on it (so all was supposed to be good), I contacted them soon for the problem as even their networks devices where in the area of power off so the problem could be here and/or there.

As it was Sunday their replay were at the rate of one in an hour and they let me makes lot of test until say at night that they will send a specialized technician to solve it.

I pass all the followed days to solicit intervention because the situation was critical for ODLK1, but it was in vain: assistance with ten-year customers proved to be practically absent!

Really unacceptable for a supplier who should guarantee a service that is always active 24h/24h!

This has now been, today they have restored the connection (it seems that the electrical works have damaged many devices throughout the area of 1Km^2).

I apologize for the situation but even replace the current internet providers will takes at least 20 working days, so the only solution was to attend their intervention.

Thanks
19 Feb 2021, 20:12:47 UTC · Discuss


Power off on 14/2/2021 for some hours
Hi,

on 14/02/2021 from 8:30 to 12:30 (Rome time) there will be a switch off for current in my region.

Maybe the power supply will last for 1 hour, then the server will shut down until current return.

thanks
13 Feb 2021, 14:26:37 UTC · Discuss


DB CF ODLS of order 11
I am officially opening a new project DB CF ODLS of order 11.

Some research on this project has already been done in the topic "ODLS of orders n>10"
https://boinc.multi-pool.info/latinsquares/forum_thread.php?id=109
and
https://boinc.progger.info/odlk/forum_thread.php?id=162

Working theme created
https://boinc.progger.info/odlk/forum_thread.php?id=176

Tomáš Brada helped me in my research.
See the topic "Diagonal Latin squares of order n>10"
https://boinc.tbrada.eu/forum_thread.php?id=3104

The project has good software, which was created by Belyshev and Harry White.

At the moment I have a small database core containing 109025 CF ODLS.

I invite everyone to join the project.
I will consider your suggestions for launching a project on the BOINC platform.
16 Jan 2021, 7:19:07 UTC · Discuss


DB CF ODLS of order 9
I am officially opening a new project "DB CF ODLS of order 9" .
This is not a BOINC project yet, but a manual project. I have been working on a project for a long time on a PC.
But you can turn a manual project into a BOINC project if you want.

Here you will find the software you need
https://yadi.sk/d/8DXzqszSThG4zA
(small archive, 2.1 MB)

The software was created by Belyshev and Harry White.

This is the script that works for me

@echo off
DLS9R1BdFdCP.exe
copy TemporaryDLS9R1BdFd.txt input.txt
kanonizator_dlk9.exe < vvod1.txt
copy output.txt input.txt
ortogon_u.exe < Y.txt
copy /b rez.txt+mates.txt rez.txt
pause

Before starting the script, you must write the starting DLS to the file DLS9R1BdFdLast.txt.
The starting DLS can be any SN DLS from any rule or any CF from the existing database.

The following programs are running in the process:
1. DLS9R1BdFdCP.exe, a program for generating CH DLK in the selected line, by Harry White;
2.kanonizator_dlk9.exe, program for SN DLK canonization, author Belyshev;
3. ortogon_u.exe, program for checking DLS on ODLS, by Belyshev.
The programs run on Windows.

The process can be looped.
The results are written to the file rez.txt.
For convenience, I copy the results from the file mates.txt, this is one of the output files of the program ortogon_u.exe.
Therefore, it is important: be sure to find all orthogonal DLSs to the squares obtained in the file rez.txt using the program ortogon_u.exe.
Then canonize all the results obtained.
And then the post-processing of the received CF ODLS (search for ODLS from ODLS) will already go.

In the archive you will find the file Variants_of_Diagonal.txt.
These are the rules (side diagonals) for the 9th order SN DLS.
I sent this file to Harry before he started writing the generator program.

You can generate SN DLS in any selected rule in any (reasonable) amount with the Harry DLS9R1BdFd.exe program, which you will also find in the archive.
Generation instructions are understandable at program requests.
If you have any questions, ask.

I posted a small database of CF ODLS for a long time here
https://yadi.sk/d/qbqG65bt3Re8RP
In this initial part of the database, there are only 6795 CF ODLS.
At the moment, the database of CF ODLS compiled by me contains 24153 CF ODLS.
This is, of course, very little yet.
But it is difficult to get many solutions on one PC.

Please join the project!

For more detailed instructions, please contact me.
You can write in the subject
https://boinc.progger.info/odlk/forum_thread.php?id=44
in the PM, as well as in the home box
natalimak1@yandex.ru

And a very important question!
I ask everyone to report the known data on the CF ODLS database of the order of 9, if you know such data.
Excluding the results of the BOINC Rake Search project. Partially the results of this project are included in the database I compiled. The rest of the results can also be included.
10 Aug 2020, 7:50:53 UTC · Discuss

Holiday
hi,

I'll be on holiday for 10/12 days from tomorrow without access to the server.

I hope that all goes fine as in the last months.

Thanks
7 Aug 2020, 19:39:43 UTC · Discuss


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