hungarian | Hungarian / Munkres ' algorithm for the linear assignment

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Hungarian / Munkres' algorithm for the linear assignment problem, in Python

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hungarian Examples and Code Snippets

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Lines of Code : 3

License : Permissive (MIT)

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> python setup.py build

> python setup.py install

>>> help('hungarian')

Community Discussions

Trending Discussions on hungarian

What is the time/space complexity of scipy.optimize.linear_sum_assignment?

MySQL / mariaDB + phpmyadmin - multipolygon field export / import error

Getting data from an updating website using perl

How to display array list from Javascript on HTML page

How to prevent user from adding duplicate values in a array in Javascript

Good VBA script fails to run on other computer

Hungarian Algorithm Constraint using Python

In R, how do I apply a VLOOKUP when an ID column is present but not otherwise relevant?

oracle sorts differently on simple order by and listagg's order by

Hungarian algorithm for change of matrix

QUESTION

What is the time/space complexity of scipy.optimize.linear_sum_assignment?

Asked 2022-Feb-15 at 07:10

What is the time/space complexity of scipy.optimize.linear_sum_assignment? It is also known as Hungarian problem

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ANSWER

Answered 2022-Feb-15 at 07:10

The documentation for scipy.optimize.linear_sum_assignment states:

This implementation [of a linear sum assignment solver] is a modified Jonker-Volgenant algorithm [as described in this 2016 paper by David Krouse].

The paper itself states:

For example, the algorithm of Jonker and Volgenant, which unbeknownst to many can be considered a particularly efficient variant of the Hungarian algorithm, has a complexity of O(n^3).

They further state that:

[T]he Jonker-Volgenant shortest augmenting path algorithm was chosen for implementation in this paper.

(This is important to note, as there are other algorithms discussed throughout the paper.)

The author makes no claim of an asymptotic runtime better than O(n^3), so I would say that the runtime is O(n^3).

Source https://stackoverflow.com/questions/71121657

QUESTION

MySQL / mariaDB + phpmyadmin - multipolygon field export / import error

Asked 2022-Jan-31 at 14:27

I exported my database from my server including a multipolygon field from MySQL 5.6.51 with phpmyadmin v4.7.9. The table:

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ANSWER

Answered 2022-Jan-31 at 14:27

Ordinary dump-restore operations don't handle geospatial data correctly. Sigh.

You could try creating a view of your data that exposes the WKT and then dumping that.

Source https://stackoverflow.com/questions/70926590

QUESTION

Getting data from an updating website using perl

Asked 2022-Jan-26 at 21:06

I've been trying to make a perl program that tells me the water level of a river from an updating website (https://www.vizugy.hu/?mapModule=OpGrafikon&AllomasVOA=73F7E310-985C-11D4-BB62-00508BA24287&mapData=Idosor), but my program can't access the website and I'm completely stuck and I'm a beginner.

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ANSWER

Answered 2022-Jan-26 at 14:53

Your code works as expected from my Linux command line. But I see exactly the same behaviour as you when using this online IDE.

The problem with LWP::Simple is that it's hard to debug what's going wrong. So I've replaced the top part of your code so it uses LWP::UserAgent instead.

Source https://stackoverflow.com/questions/70863661

QUESTION

How to display array list from Javascript on HTML page

Asked 2022-Jan-26 at 05:10

I am trying to display the array in Javascript to the HTML page. I've looked through a lot of questions on here about this topic and tried quite a few different things but I can't seem to get it work. I can only get the array to be created and store the values and clear when I click the appropriate button when looking in the console tool.

When the add item button is clicked it should show each element entered on the ID listItemsHolder and the clear button clears the list. I appreciate any help I can get. Code below:

Javascript:

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ANSWER

Answered 2022-Jan-26 at 05:07

First you are referencing listItemHolder and not listItemsHolder on the line below.

Source https://stackoverflow.com/questions/70858678

QUESTION

How to prevent user from adding duplicate values in a array in Javascript

Asked 2022-Jan-25 at 20:18

I have been looking all over for a correct answer on this but can't seem to get one that works. I am trying to take input for an array that allows a max of 6 entries and does not allow duplicates. My code that I was playing around with only alerts me when I already have duplicates in the array. What would be the correct way to prevent a duplicate value from ever being added then displaying an error stating so?

I need to carry it over to list on the HTML doc but for right now I'm working on not allowing it to add duplicates so I've been using the Console tool

Any help would be much appreciated

Javascript:

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ANSWER

Answered 2022-Jan-25 at 20:10

To verify if a value is duplicate or not, you can pass the value you're checking to your hasDuplicates function and use the JavaScript array built-in method includes().

Source https://stackoverflow.com/questions/70854914

QUESTION

Good VBA script fails to run on other computer

Asked 2021-Dec-09 at 08:09

I have a very complex excel macro workbook. The VBA code seems to run pretty well on PC's at my location. As soon as I send it to a German colleague it fails to run in unexpected locations of the code.
The last problem I came across is a Runtime error 5 when the code try to modify the Caption of a UserForm (and some text boxes and cmd buttons as well).
Previously we faced with the same issue with SlicerCache(x).ClearManualFilter but somehow I healed itself...

My first thought was to break up the nest With and see which row causes the fail, but it's immediately the first row. I assume it'll do the same for all rows.
I have checked the windows and office settings:

I'm running Win10, English language settings and Hungarian formatting settings. -> Code running well.
My local colleagues run the same system with Hungarian language and formatting. -> Code running well.
The problematic colleague runs Win10 with German language and formatting settings. -> Code fails to run.
We both have the same Reference libraries in VBA editor, none missing. (I assume it's carried by the excel file itself.)
I have Microsoft 365 MSO (16.0.13801.21050) 32-bit, he running 16.013801.21004 32-bit. (I suppose the update scheduled by the IT department.) This portion of code months before my latest office update, so I don't think it's a cause.

The sub called by a CommandButton_Click event, and calls the user form zurueckExport. The form is deisgned so that can called for differnet purposes, so the captions have to be modified according to the needs.

I have ran out of ideas, don't see what and why cause it. Does anybody could give me some help to deal with this issue? I would be very glad.

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ANSWER

Answered 2021-Dec-09 at 08:09

The captions were too long, that generated the error message on the other computer.

Resolution:
I have added several different labels to the UserForm and modify their visibility instead of overwrite the caption.

Many thanks for @J0eBl4ck for the idea.

Source https://stackoverflow.com/questions/70210822

QUESTION

Hungarian Algorithm Constraint using Python

Asked 2021-Dec-04 at 11:17

I have dataframe of job and employee, with the duration each employee can finish each job. I want to use Hungarian algorithm to assign each job to 1 employee, and each employee can only assigned by 1 job.

Here is the data:

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ANSWER

Answered 2021-Dec-04 at 11:17

Assuming df the input dataframe, you can use scipy.optimize.linear_sum_assignment:

Source https://stackoverflow.com/questions/70224898

QUESTION

In R, how do I apply a VLOOKUP when an ID column is present but not otherwise relevant?

Asked 2021-Dec-02 at 08:08

There are many related questions here about this issue, particulalry using left_join from dplyr , but I still can't figure it out.

All I want to do is return LanguageClean in Lookup based on a match to the Language column in df. If there is no match, simply return NA. I want LanguageClean added as a new column to df.

I can see that my code below is replicating the ID, but I don't want it to. The ID column is irrelevant for my purposes here, although I need to retain it in the final dataframe.

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ANSWER

Answered 2021-Dec-02 at 08:08

The issue is that your lookup table contains multiple entries for some languages. Hence you end up with multiple matches. So solve your issue you could filter out the distinct or unique combinations from your lookup using dplyr::distinct:

Source https://stackoverflow.com/questions/70195865

QUESTION

oracle sorts differently on simple order by and listagg's order by

Asked 2021-Nov-24 at 17:08

Oracle Database 19c Standard Edition 2 Release 19.0.0.0.0 - Production

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ANSWER

Answered 2021-Nov-24 at 16:50

Ordering of letters depends critically on NLS_SORT, so what you say at the end of your message is perfectly wrong.

The main question is - are you getting those contradictory results on exactly the same system, with all the same NLS settings? If so, then that's a bug in the implementation of the ORDER BY clause in LISTAGG. It would be good to have a test case - show us your NLS settings (the result of select * from v$nls_parameters) followed immediately by the two queries and their outputs. For good measure, show also select * from v$version (telling us your database version).

Source https://stackoverflow.com/questions/70099848

QUESTION

Hungarian algorithm for change of matrix

Asked 2021-Nov-07 at 17:50

I need to implement the realization of Hungarian algorithm for such task: I have any example of matrix(actually I need this for cluster analysis):

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ANSWER

Answered 2021-Oct-29 at 02:29

Try with RcppHungarian function. However, the values have to be non-negative, so I have changed the data a bit!

Source https://stackoverflow.com/questions/69762777

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