I have a vector, for example, (1,2,3,4) and I want

问题:

I have a vector, (1,2,3,4) and I want to label 1 with 'AA', 2 with 'AB', 3 with 'CD', 4 with 'Hello', whatever. It should by like a vector ('AA','AB','CD','Hello'). Is it possible?

回答1:

MATLAB has a Map container type:

keySet = 1:4;
valSet = {'AA','AB','CD','Hello'};
map = containers.Map(keySet,valSet);

Get some requested values with the values method:

>> vals = map.values(num2cell([3 2 1 4]))
vals = 
    'CD'    'AB'    'AA'    'Hello'

回答2:

easy peasy, use a cell array, for example:

v = {'AA','AB','CD','Hello'};

then try,

v{1}

etc. (note the curly brackets...{})

EDIT: this is parallel to :

v{1}='AA';
v{2}='AB'; ...
...

回答3:

You probably want to use a cellstr array to store the output names, and use a mapping table to translate your inputs in to outputs.

% List of labels that correspond to the indexes of the array
labels = {'AA', 'AB', 'CD', 'Hello'};

% Input vector
v = [1 2 3 1 4 2];

% Use multi-element indexing with () instead of {} to map them
strs = labels(v);

You'll get a cellstr array back of the same size as the input, containing the labels corresponding to the index value in each element. You can index in to it like strs{3} to get the individual labels out.