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repeated_combination-i.ri
U:RDoc::AnyMethod[iI"repeated_combination:ETI" Array#repeated_combination;TF: publico:RDoc::Markup::Document: @parts[o: RDoc::Markup::Paragraph; [I"]Calls the block with each repeated combination of length +n+ of the elements of +self+; ;TI"$each combination is an \Array; ;TI"Dreturns +self+. The order of the combinations is indeterminate.;To: RDoc::Markup::BlankLine o; ; [I"\When a block and a positive \Integer argument +n+ are given, calls the block with each ;TI"?+n+-tuple repeated combination of the elements of +self+. ;TI"9The number of combinations is <tt>(n+1)(n+2)/2</tt>.;T@o; ; [I" +n+ = 1:;To:RDoc::Markup::Verbatim; [I"a = [0, 1, 2] ;TI">a.repeated_combination(1) {|combination| p combination } ;T: @format0o; ; [I" Output:;To; ; [I" [0] ;TI" [1] ;TI" [2] ;T; 0o; ; [I" +n+ = 2:;To; ; [I">a.repeated_combination(2) {|combination| p combination } ;T; 0o; ; [I" Output:;To; ; [ I" [0, 0] ;TI" [0, 1] ;TI" [0, 2] ;TI" [1, 1] ;TI" [1, 2] ;TI" [2, 2] ;T; 0o; ; [I"?If +n+ is zero, calls the block once with an empty \Array.;T@o; ; [I"1If +n+ is negative, does not call the block:;To; ; [I"Fa.repeated_combination(-1) {|combination| fail 'Cannot happen' } ;T; 0o; ; [I"1Returns a new \Enumerator if no block given:;To; ; [I"a = [0, 1, 2] ;TI"La.repeated_combination(2) # => #<Enumerator: [0, 1, 2]:combination(2)> ;T; 0o; ; [I"LUsing Enumerators, it's convenient to show the combinations and counts ;TI" for some values of +n+:;To; ; [I"#e = a.repeated_combination(0) ;TI"e.size # => 1 ;TI"e.to_a # => [[]] ;TI"#e = a.repeated_combination(1) ;TI"e.size # => 3 ;TI"!e.to_a # => [[0], [1], [2]] ;TI"#e = a.repeated_combination(2) ;TI"e.size # => 6 ;TI"Ae.to_a # => [[0, 0], [0, 1], [0, 2], [1, 1], [1, 2], [2, 2]];T; 0: @fileI" array.c;T:0@omit_headings_from_table_of_contents_below0I"parray.repeated_combination(n) {|combination| ... } -> self array.repeated_combination(n) -> new_enumerator ;T0[ I" (p1);T@UFI" Array;TcRDoc::NormalClass00