Indicator function

Indicator function - function that returns 1 if an element is present in a specified subset and 0 if absent; naturally isomorphic with a set's subsets. Article "Indicator function" in English Wikipedia has 31 points for quality (as of July 1, 2025). The article contains 11 references and 11 sections. The article also contains quality flaw template, which reduce quality score.

In this language version of Wikipedia the article has the best quality. Also, this article is the most popular in that language version.

Since the creation of article "Indicator function", its content was written by 119 registered users of English Wikipedia and edited by 527 registered Wikipedia users in all languages.

The article is cited 300 times in English Wikipedia and cited 1694 times in all languages.

The highest Authors Interest rank from 2001:

• Local (English): #9932 in March 2004
• Global: #19096 in June 2003

The highest popularity rank from 2008:

• Local (English): #79754 in October 2020
• Global: #86650 in November 2021

There are 32 language versions for this article in the WikiRank database (of the considered 55 Wikipedia language editions).

The quality and popularity assessment was based on Wikipédia dumps from July 1, 2025 (including revision history and pageviews for previous years).

The table below shows the language versions of the article with the highest quality.

#	Language	Quality grade	Quality score
1	English (en) Indicator function		30.9946
2	Indonesian (id) Fungsi indikator		26.2287
3	Kazakh (kk) Сипаттауыш функция		21.2749
4	Polish (pl) Funkcja charakterystyczna zbioru		19.2257
5	Armenian (hy) Վեկտորի ինդիկատոր		17.3814
6	Ukrainian (uk) Характеристична функція		16.6848
7	German (de) Indikatorfunktion		15.9919
8	Korean (ko) 지시 함수		14.8281
9	Hebrew (he) פונקציה מציינת		12.9154
10	Galician (gl) Función indicadora		11.7838

More...

The following table shows the most popular language versions of the article.

The most popular language versions of the article "Indicator function" in all the time

#	Language	Popularity award	Relative popularity
1	English (en) Indicator function		1 783 462
2	French (fr) Fonction caractéristique (théorie des ensembles)		217 937
3	German (de) Indikatorfunktion		181 927
4	Japanese (ja) 指示関数		156 516
5	Russian (ru) Индикатор (математика)		128 341
6	Chinese (zh) 指示函数		113 501
7	Italian (it) Funzione indicatrice		113 388
8	Spanish (es) Función indicatriz		88 443
9	Polish (pl) Funkcja charakterystyczna zbioru		72 495
10	Korean (ko) 지시 함수		43 393

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The following table shows the language versions of the article with the highest popularity in the last month.

The most popular language versions of the article "Indicator function" in June 2025

#	Language	Popularity award	Relative popularity
1	English (en) Indicator function		5 448
2	German (de) Indikatorfunktion		732
3	Japanese (ja) 指示関数		564
4	Russian (ru) Индикатор (математика)		456
5	French (fr) Fonction caractéristique (théorie des ensembles)		448
6	Chinese (zh) 指示函数		390
7	Italian (it) Funzione indicatrice		278
8	Spanish (es) Función indicatriz		232
9	Korean (ko) 지시 함수		146
10	Polish (pl) Funkcja charakterystyczna zbioru		122

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The following table shows the language versions of the article with the highest Authors’ Interest.

Language versions of the article "Indicator function" with the highest Authors Interest (number of authors). Only registered Wikipedia users were taken into account.

#	Language	AI award	Relative AI
1	English (en) Indicator function		119
2	German (de) Indikatorfunktion		62
3	French (fr) Fonction caractéristique (théorie des ensembles)		39
4	Italian (it) Funzione indicatrice		32
5	Russian (ru) Индикатор (математика)		32
6	Japanese (ja) 指示関数		28
7	Hebrew (he) פונקציה מציינת		26
8	Polish (pl) Funkcja charakterystyczna zbioru		23
9	Dutch (nl) Indicatorfunctie		22
10	Finnish (fi) Indikaattorifunktio		15

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The following table shows the language versions of the article with the highest Authors’ Interest in the last month.

Language versions of the article "Indicator function" with the highest AI in June 2025

#	Language	AI award	Relative AI
1	Bulgarian (bg) Индикаторна функция		0
2	Catalan (ca) Funció característica (matemàtiques)		0
3	Czech (cs) Charakteristická funkce		0
4	Danish (da) Indikatorfunktion		0
5	German (de) Indikatorfunktion		0
6	English (en) Indicator function		0
7	Spanish (es) Función indicatriz		0
8	Basque (eu) Funtzio adierazle		0
9	Persian (fa) تابع مشخصه		0
10	Finnish (fi) Indikaattorifunktio		0

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The following table shows the language versions of the article with the highest number of citations.

Language versions of the article "Indicator function" with the highest Citation Index (CI)

#	Language	CI award	Relative CI
1	English (en) Indicator function		300
2	Japanese (ja) 指示関数		178
3	French (fr) Fonction caractéristique (théorie des ensembles)		144
4	Korean (ko) 지시 함수		124
5	Polish (pl) Funkcja charakterystyczna zbioru		114
6	German (de) Indikatorfunktion		113
7	Italian (it) Funzione indicatrice		72
8	Ukrainian (uk) Характеристична функція		66
9	Russian (ru) Индикатор (математика)		63
10	Chinese (zh) 指示函数		61

More...

#	Language	Value
bg	Bulgarian Индикаторна функция
ca	Catalan Funció característica (matemàtiques)
cs	Czech Charakteristická funkce
da	Danish Indikatorfunktion
de	German Indikatorfunktion
en	English Indicator function
es	Spanish Función indicatriz
eu	Basque Funtzio adierazle
fa	Persian تابع مشخصه
fi	Finnish Indikaattorifunktio
fr	French Fonction caractéristique (théorie des ensembles)
gl	Galician Función indicadora
he	Hebrew פונקציה מציינת
hi	Hindi सूचक फलन
hu	Hungarian Karakterisztikus függvény
hy	Armenian Վեկտորի ինդիկատոր
id	Indonesian Fungsi indikator
it	Italian Funzione indicatrice
ja	Japanese 指示関数
kk	Kazakh Сипаттауыш функция
ko	Korean 지시 함수
ms	Malay Fungsi penunjuk
nl	Dutch Indicatorfunctie
pl	Polish Funkcja charakterystyczna zbioru
pt	Portuguese Função indicadora
ru	Russian Индикатор (математика)
sr	Serbian Функција индикатор
ta	Tamil சுட்டுச் சார்பு
th	Thai ฟังก์ชันบ่งชี้
uk	Ukrainian Характеристична функція
vi	Vietnamese Hàm chỉ thị
zh	Chinese 指示函数

Best Rank

English: #79754 10.2020

Global: #86650 11.2021

Best Rank

English: #9932 03.2004

Global: #19096 06.2003

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The WikiRank project is intended for automatic relative evaluation of the articles in the various language versions of Wikipedia. At the moment the service allows to compare over 44 million Wikipedia articles in 55 languages. Quality scores of articles are based on Wikipedia dumps from July, 2025. When calculating current popularity and AI of articles data from June 2025 was taken into account. For historical values of popularity and AI WikiRank used data from 2001 to 2025... More information