Property talk:P1171

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approximation algorithm
method used to approximate a number

Description	approximation algorithm (Q621751): method used to approximate this number. See also determination method or standard (P459).
Represents	approximation algorithm (Q621751)
Data type	Item
Domain	According to this template: number (Q11563), maybe also other mathematical or physical objects ... According to statements in the property: number (Q11563) or function (Q11348) When possible, data should only be stored as statements
Allowed values	approximation algorithm (Q621751) : algorithm used to compute an approximation of the subject value (note: this should be moved to the property statements)
Example	According to this template: Pi : ⟨ pi (Q167)    ⟩ approximation algorithm (P1171) ⟨ Gauss–Legendre algorithm (Q2448949)    ⟩ According to statements in the property: pi (Q167) → Gauss–Legendre algorithm (Q2448949) square root (Q134237) → Heron's method (Q20725439) When possible, data should only be stored as statements
Tracking: usage	Category:Pages using Wikidata property P1171 (Q125145000)
See also	determination method or standard (P459)
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties By value of property Most statements Fewest statements Most sitelinks Most linked wikis Total of sitelinks on items Most identifiers Fewest identifiers Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P1171 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 26 Main statement 22 84.6% of uses Qualifier 3 11.5% of uses Reference 1 3.8% of uses
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[create Create a translatable help page (preferably in English) for this property to be included here]

Type “number (Q11563), function (Q11348)”: item must contain property “instance of (P31), subclass of (P279)” with classes “number (Q11563), function (Q11348)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303). Known exceptions: zero of a function (Q214604)
List of violations of this constraint: Database reports/Constraint violations/P1171#Type Q11563, Q11348, SPARQL

Value type “approximation algorithm (Q621751)”: This property should use items as value that contain property “instance of (P31), subclass of (P279)”. On these, the value for instance of (P31), subclass of (P279) should be an item that uses subclass of (P279) with value approximation algorithm (Q621751) (or a subclass thereof). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1171#Value type Q621751, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1171#Entity types

Scope is as main value (Q54828448): the property must be used by specified way only (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P1171#Scope, SPARQL

P459

@TomT0m, Paperoastro, Tobias1984:. Thinking about it, maybe it would make sense to use determination method or standard (P459) for that. If the item is an instance of number and the property value an instance (subclass ?) of algorithm, it should be clear that it means "algorithm giving a value for the number" ? --Zolo (talk) 09:29, 1 March 2014 (UTC)

@Zolo: I missed that we already have that property. That is something we should think about. --Tobias1984 (talk) 09:54, 1 March 2014 (UTC)

seems to make sense. We should regroup the usecases and try to model them. One usecase that come to my mind are optimisation algorithms, for which we got exact methods (algorithms) and approximation algorithms (and families of algorithm) such as metaheuristics. Relevant items I can think of includes travelling salesperson problem (Q322212)    simplex algorithm (Q134164)   , metaheuristic (Q1385229)    tabu search (Q1424540)    PageRank (Q184316) Eh cool we can drag and drop results from the searchbox suggestion list to the edit zone !. I think determination method or standard (P459) can also be used for experiments in the real world to measure a physical constants, but we could discriminate the methods by the type of the object (I often says algorithms are methods to solve problems in real world, I think we got a case :) ). It could be interesting to think how works such as http://link.springer.com/chapter/10.1007%2F3-540-61422-2_124 fits in this scheme. optical character recognition (Q167555) and automatic classification algorithms (a little bit more complex) ... TomT0m (talk) 11:17, 1 March 2014 (UTC)

I also missed P459, but the idea of TomT0m likes me. --Paperoastro (talk) 15:22, 1 March 2014 (UTC)

Can This Property be Used on Functions?

While discussing Wikidata:Property proposal/iterative approximation, @Midleading and I tried adding the statement Lambert W function (Q429331)approximation algorithm (P1171)Newton's method (Q374195) because it's possible to approximate the value of the Lambert W function at each point using Newton's method. This statement displays a type constraint, however. Does anybody object to adding function (Q11348) to the list of permitted types for this property? — The Erinaceous One 🦔 18:41, 14 September 2022 (UTC)

I just broaden the scope to allow functions as well. Midleading (talk) 02:51, 19 November 2022 (UTC)