Class: RDF::N3::Algebra::Math::Sum

Inherits:
ListOperator show all
Defined in:
vendor/bundler/ruby/2.7.0/bundler/gems/rdf-n3-edf63ce7750f/lib/rdf/n3/algebra/math/sum.rb

Overview

schema: ($a_1 .. $a_n) math:sum $a_s

summary: performs addition of numbers

definition: true if and only if the arithmetic sum of $a_1, .. $a_n equals $a_s. Requires either:

  1. all $a_1, .., $a_n to be bound; or
  2. all but one $a_i (subject list) to be bound, and $a_s to be bound.

literal domains:

  • $a_1 .. $a_n : xs:decimal (or its derived types), xs:float, or xs:double (see note on type promotion, and casting from string)
  • $a_s: xs:decimal (or its derived types), xs:float, or xs:double (see note on type promotion, and casting from string)

Examples:

{ ("3" "5") math:sum ?x } => { ?x :valueOf "3 + 5" } .
{ (3 5) math:sum ?x } => { ?x :valueOf "3 + 5 = 8" } .

See Also:

Constant Summary collapse

NAME =
:mathSum
URI =
RDF::N3::Math[:sum]

Constants included from Util::Logger

Util::Logger::IOWrapper

Constants inherited from SPARQL::Algebra::Operator::Binary

SPARQL::Algebra::Operator::Binary::ARITY

Constants inherited from SPARQL::Algebra::Operator

SPARQL::Algebra::Operator::ARITY, SPARQL::Algebra::Operator::IsURI

Instance Attribute Summary

Attributes included from Enumerable

#existentials, #universals

Attributes included from SPARQL::Algebra::Query

#solutions

Attributes inherited from SPARQL::Algebra::Operator

#operands

Instance Method Summary collapse

Methods inherited from ListOperator

#execute, #input_operand, #validate

Methods included from Builtin

#each, #evaluate, #hash, #input_operand, #rank, #to_uri

Methods included from Util::Logger

#log_debug, #log_depth, #log_error, #log_fatal, #log_info, #log_recover, #log_recovering?, #log_statistics, #log_warn, #logger

Methods included from Enumerable

add_entailment, #dump, #each_graph, #each_object, #each_predicate, #each_quad, #each_statement, #each_subject, #each_term, #each_triple, #entail, #enum_graph, #enum_object, #enum_predicate, #enum_quad, #enum_statement, #enum_subject, #enum_term, #enum_triple, #graph_names, #has_graph?, #has_object?, #has_predicate?, #has_quad?, #has_statement?, #has_subject?, #has_term?, #has_triple?, #invalid?, #method_missing, #objects, #predicates, #project_graph, #quads, #respond_to_missing?, #statements, #subjects, #supports?, #terms, #to_a, #to_h, #to_set, #triples, #valid?, #validate!

Methods included from Util::Aliasing::LateBound

#alias_method

Methods included from Countable

#count, #empty?

Methods included from Isomorphic

#bijection_to, #isomorphic_with?

Methods included from SPARQL::Algebra::Update

#execute, #graph_name=, #unshift, #variables

Methods included from SPARQL::Algebra::Query

#each_solution, #empty?, #execute, #failed?, #graph_name=, #matched?, #query_yields_boolean?, #query_yields_solutions?, #query_yields_statements?, #unshift, #variables

Methods inherited from SPARQL::Algebra::Operator::Binary

#initialize

Methods inherited from SPARQL::Algebra::Operator

#aggregate?, arity, base_uri, #base_uri, base_uri=, #bind, #boolean, #constant?, #deep_dup, #each_descendant, #eql?, #evaluatable?, evaluate, #executable?, #first_ancestor, for, #formulae, #initialize, #inspect, #ndvars, #node?, #operand, #optimize, #optimize!, #parent, #parent=, #prefixes, prefixes, prefixes=, #rewrite, #to_binary, #to_sxp, #to_sxp_bin, #validate!, #variable?, #vars

Methods included from SPARQL::Algebra::Expression

cast, #constant?, #evaluate, extension, extensions, for, #invalid?, new, #node?, open, #optimize, #optimize!, parse, register_extension, #to_sxp_bin, #valid?, #validate!, #variable?

Constructor Details

This class inherits a constructor from SPARQL::Algebra::Operator::Binary

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class RDF::Enumerable

Instance Method Details

#resolve(list) ⇒ RDF::Term

Evaluates to the sum of the list elements

Parameters:

Returns:

See Also:

  • ListOperator#evaluate


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# File 'vendor/bundler/ruby/2.7.0/bundler/gems/rdf-n3-edf63ce7750f/lib/rdf/n3/algebra/math/sum.rb', line 36

def resolve(list)
  list.to_a.map(&:as_number).reduce(&:+) || RDF::Literal(0)  # Empty list sums to 0
end