isTerminal {xegaBNF}R Documentation

Is the numeric identifier a terminal symbol?

Description

isTerminal() tests if the numeric identifier is a terminal symbol.

Usage

isTerminal(Id, ST)

Arguments

Id

A numeric identifier (integer).

ST

A symbol table.

Details

isTerminal() is one of the most frequently used functions of a grammar-based genetic programming algorithm. Careful coding pays off! Do not index the symbol table as a matrix (e.g. ST[2,2]), because this is really slow!

Value

See Also

Other Utility Functions: derive(), id2symb(), isNonTerminal(), rules(), symb2id()

Examples

g<-compileBNF(booleanGrammar())
isTerminal(1, g$ST)
isTerminal(2, g$ST)
isTerminal(5, g$ST)
isTerminal(12, g$ST)
isTerminal(15, g$ST)
identical(isTerminal(15, g$ST), NA)


[Package xegaBNF version 1.0.0.0 Index]