remove

Delete key-value pairs from Map object

Syntax

remove(M,keySet)

Description

remove(M,keySet) deletes the specified keys, and the values associated with them, from the input Map object.

Examples

Remove Key-Value Pair

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

keys(M)

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

values(M)

ans = 1x3 cell
    {'Li, N.'}    {'Jones, R.'}    {'Sanchez, C.'}

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

remove(M,2362);
keys(M)

ans=1×2 cell array
    {[437]}    {[1089]}

values(M)

ans = 1x2 cell
    {'Li, N.'}    {'Jones, R.'}

Remove Multiple Key-Value Pairs

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 = 1x4 cell
    {'Apr'}    {'Feb'}    {'Jan'}    {'Mar'}

values(M)

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 = 1x1 cell array
    {'Jan'}

values(M)

ans = 1x1 cell array
    {[327.2000]}

Input Arguments

M — Input Map object

Map object

Input Map object.

keySet — Keys of key-value pairs to remove

numeric scalar | character vector | string scalar | cell array

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, specify keySet as a cell array—even when you specify the keys as numeric scalars or strings.