keyHash

Generate hash code for dictionary key

Since R2022b

Syntax

h = keyHash(A)

Description

h = keyHash(A) returns a uint64 scalar that represents the input array, A.

The keyHash function generates a hash code based on the properties of the input. For custom classes keyHash may need to be overloaded to ensure correct equivalence. For more information on using custom classes with dictionary, see Dictionaries and Custom Classes

Note

keyHash uses a random seed. Results are not reproducible between MATLAB Sessions or across parallel workers.

Examples

Create Hash Code

Use keyHash to create hash code for several arrays.

h = keyHash([1 2 3 4])

h =

  uint64

   15176618535206774870

h = keyHash(["monocycle" "bicycle" "tricycle"])

h =

  uint64

   680190522706874070

Input Arguments

A — Input array of dictionary keys

array

Input array of dictionary keys, specified as an array.

Output Arguments

h — Hash code

uint64 scalar

Hash code, specified as a uint64 scalar.

Version History

Introduced in R2022b