isKey - Determine if Map object contains key - MATLAB (original) (raw)

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Determine if Map object contains key

Syntax

Description

Note

dictionary is recommended overcontainers.Map because it accepts more data types as keys and values and provides better performance. (since R2022b)

TF = isKey([M](#d126e926316),[keySet](#d126e926341)) returns 1 (true) if M contains the specified key, and returns 0 (false) otherwise.

If keySet is an array that specifies multiple keys, thenTF is a logical array of the same size.

example

Examples

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Create a Map object containing several key-value pairs.

months = {'Jan','Feb','Mar','Apr'}; rainfall = [327.2 368.2 197.6 178.4]; M = containers.Map(months,rainfall)

M = Map with properties:

    Count: 4
  KeyType: char
ValueType: double

Determine whether m has 'Feb' as a key.

Search for multiple keys.

keySet = {'Mar','Apr','May','Jun'}; TF = isKey(M,keySet)

TF = 1×4 logical array

1 1 0 0

Input Arguments

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Keys to search for in the Map object, specified as a numeric scalar, character vector, string scalar, or cell array. To search for multiple keys, specify keySet as a cell array—even when you specify keys as numeric scalars or strings.

Version History

Introduced in R2008b