Map matrix element to string

Question

I would like to map numeric output from a matrix to a string.

Given

compute=[ 7, 4, 3; 3, 4, 7]

how can one obtain a string mappin

Answer 1

MATLAB has a Map container type that makes this very straighftorward:

keySet = [7, 4, 3];
valSet = {'Run', 'Walk', 'Jog'};
map = containers.Map(keySet,valSet);

Get the requested values:

>> vals = values(map,num2cell(compute))
vals = 
    'Run'    'Walk'    'Jog'
    'Jog'    'Walk'    'Run'

This is a class after all, so you can also use a more familiar OOP syntax for calling the values method:

>> vals = map.values(num2cell(compute))
vals = 
    'Run'    'Walk'    'Jog'
    'Jog'    'Walk'    'Run'

Answer 2

You can use cell array

strs = {'one','two','Jog','Walk','five','six','Run'};

compute=[ 7, 4, 3; 3, 4, 7];

out = strs(compute);

out =

'Run'    'Walk'    'Jog'
'Jog'    'Walk'    'Run'

Answer 3

>> map={'a','b','Jog','Walk','e','f','Run'}

map = 

    'a'    'b'    'Jog'    'Walk'    'e'    'f'    'Run'

>> map(compute)

ans = 

    'Run'    'Walk'    'Jog'
    'Jog'    'Walk'    'Run'

Answer 4

I assume you have the map in a form of a cell array

>> map{3} = 'Jog';
>> map{4} = 'Walk';
>> map{7} = 'Run';

Now use the map

map( compute )

will give you a cell array of strings