#jsDisabledContent { display:none; } My Account | Register | Help

# Hamming distance

Article Id: WHEBN0000041227
Reproduction Date:

 Title: Hamming distance Author: World Heritage Encyclopedia Language: English Subject: Collection: Publisher: World Heritage Encyclopedia Publication Date:

### Hamming distance

 3-bit binary cube for finding Hamming distance Two example distances: 100→011 has distance 3 (red path); 010→111 has distance 2 (blue path) 4-bit binary tesseract for finding Hamming distance Two example distances: 0100→1001 has distance 3 (red path); 0110→1110 has distance 1 (blue path)

In information theory, the Hamming distance between two strings of equal length is the number of positions at which the corresponding symbols are different. In another way, it measures the minimum number of substitutions required to change one string into the other, or the minimum number of errors that could have transformed one string into the other.

## Contents

• Examples 1
• Special properties 2
• History and applications 3
• Algorithm example 4
• Notes 6
• References 7

## Examples

The Hamming distance between:

• "karolin" and "kathrin" is 3.
• "karolin" and "kerstin" is 3.
• 1011101 and 1001001 is 2.
• 2173896 and 2233796 is 3.

## Special properties

For a fixed length n, the Hamming distance is a metric on the vector space of the words of length n, as it fulfills the conditions of non-negativity, identity of indiscernibles and symmetry, and it can be shown by complete induction that it satisfies the triangle inequality as well. The Hamming distance between two words a and b can also be seen as the Hamming weight of ab for an appropriate choice of the − operator.

For binary strings a and b the Hamming distance is equal to the number of ones (population count) in a XOR b. The metric space of length-n binary strings, with the Hamming distance, is known as the Hamming cube; it is equivalent as a metric space to the set of distances between vertices in a hypercube graph. One can also view a binary string of length n as a vector in R^n by treating each symbol in the string as a real coordinate; with this embedding, the strings form the vertices of an n-dimensional hypercube, and the Hamming distance of the strings is equivalent to the Manhattan distance between the vertices.

## History and applications

The Hamming distance is named after Richard Hamming, who introduced it in his fundamental paper on Hamming codes Error detecting and error correcting codes in 1950.[1] It is used in telecommunication to count the number of flipped bits in a fixed-length binary word as an estimate of error, and therefore is sometimes called the signal distance. Hamming weight analysis of bits is used in several disciplines including information theory, coding theory, and cryptography. However, for comparing strings of different lengths, or strings where not just substitutions but also insertions or deletions have to be expected, a more sophisticated metric like the Levenshtein distance is more appropriate. For q-ary strings over an alphabet of size q ≥ 2 the Hamming distance is applied in case of orthogonal modulation, while the Lee distance is used for phase modulation. If q = 2 or q = 3 both distances coincide.

The Hamming distance is also used in systematics as a measure of genetic distance.[2]

On a grid such as a chessboard, the Hamming distance is the minimum number of moves it would take a rook to move from one cell to the other.

## Algorithm example

The Python function `hamming_distance()` computes the Hamming distance between two strings (or other iterable objects) of equal length, by creating a sequence of Boolean values indicating mismatches and matches between corresponding positions in the two inputs, and then summing the sequence with False and True values being interpreted as zero and one.

```def hamming_distance(s1, s2):
#Return the Hamming distance between equal-length sequences
if len(s1) != len(s2):
raise ValueError("Undefined for sequences of unequal length")
return sum(ch1 != ch2 for ch1, ch2 in zip(s1, s2))
```

The following C function will compute the Hamming distance of two integers (considered as binary values, that is, as sequences of bits). The running time of this procedure is proportional to the Hamming distance rather than to the number of bits in the inputs. It computes the bitwise exclusive or of the two inputs, and then finds the Hamming weight of the result (the number of nonzero bits) using an algorithm of Wegner (1960) that repeatedly finds and clears the lowest-order nonzero bit.

```int hamming_distance(unsigned x, unsigned y)
{
int       dist;
unsigned  val;

dist = 0;
val = x ^ y;    // XOR

// Count the number of bits set
while (val != 0)
{
// A bit is set, so increment the count and clear the bit
dist++;
val &= val - 1;
}

// Return the number of differing bits
return dist;
}
```

## Notes

1. ^ Hamming (1950).
2. ^ Pilcher, Wong & Pillai (2008).

## References

•  This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".
• .
• Pilcher, C. D.; Wong, J. K.; Pillai, S. K. (March 2008), "Inferring HIV transmission dynamics from phylogenetic sequence relationships", PLoS Med. 5 (3): e69, .
• .
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.

Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.

By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.