String Length

A String Length is a sequence length function that is a string function (whose input is a string.

• Context:
  • It can be an Entity Size Measure.
• Example(s):
  • StringLength("this string") ⇒ 11.
  • StringLength(ATCATGGC) ⇒ 8.
  • StringLength(Empty String) ⇒ 0.
  • Document Length.
  • …
• Counter-Example(s):
  • a Sequence Length.
  • a Set Size.
• See: String Distance Measure, Count Function.

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References

2009

• http://en.wikipedia.org/wiki/String_(computer_science)
  • The length of a string is the number of characters in the string (the length of the sequence) and can be any non-negative integer. The empty string is the unique string over Σ of length 0, and is denoted ε or λ.

2007

• (Kakkonen, 2007) ⇒ Tuomo Kakkonen. (2007). “Framework and Resources for Natural Language Evaluation." Academic Dissertation. University of Joensuu.
  • Let [math]\displaystyle{ \Sigma }[/math] be an alphabet.
  • A finite sequence of symbols [math]\displaystyle{ S=(x_1 x_2 … x_n), n≥0, x \in \Sigma }[/math] is called a string in alphabet [math]\displaystyle{ \Sigma }[/math].
  • The length |S| of string S is n.
  • The empty string is the sequence of length 0; written [math]\displaystyle{ \varepsilon }[/math].

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