remove - Delete key-value pairs from Map object - MATLAB (original) (raw)

Delete key-value pairs from Map object

Syntax

Description

Note

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

remove([M](#d126e1560240),[keySet](#d126e1560265)) deletes the specified keys, and the values associated with them, from the inputMap object.

example

Examples

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Create a Map object. Display its keys and values.

ids = [437 1089 2362]; names = {'Li, N.','Jones, R.','Sanchez, C.'}; M = containers.Map(ids,names)

M = Map with properties:

    Count: 3
  KeyType: double
ValueType: char

ans=1×3 cell array {[437]} {[1089]} {[2362]}

ans = 1×3 cell {'Li, N.'} {'Jones, R.'} {'Sanchez, C.'}

Remove a key-value pair. Display the updated keys and values.

ans=1×2 cell array {[437]} {[1089]}

ans = 1×2 cell {'Li, N.'} {'Jones, R.'}

Create a Map object.

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

ans = 1×4 cell {'Apr'} {'Feb'} {'Jan'} {'Mar'}

ans=1×4 cell array {[178.4000]} {[368.2000]} {[327.2000]} {[197.6000]}

To remove multiple key-value pairs, specify the keys as a cell array.

keySet = {'Feb','Mar','Apr'}; remove(M,keySet); keys(M)

ans = 1×1 cell array {'Jan'}

ans = 1×1 cell array {[327.2000]}

Input Arguments

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Keys of the key-value pairs to remove from the Map object, specified as a numeric scalar, character vector, string scalar, or cell array. To remove multiple key-value pairs, specifykeySet as a cell array—even when you specify the keys as numeric scalars or strings.

Version History

Introduced in R2008b