# String Length

(Redirected from String Length Function)

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.

## 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]\Sigma[/math] be an alphabet.
- A finite sequence of symbols [math]S=(x_1 x_2 … x_n), n≥0, x \in \Sigma[/math] is called a
*string*in alphabet [math]\Sigma[/math]. - The
*length*|S| of string S is*n*. - The
*empty string*is the sequence of length 0; written [math]\varepsilon[/math].