Selecting categorical variable range to plot on bar graph

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Nex 2021-9-29

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https://ww2.mathworks.cn/matlabcentral/answers/1462854-selecting-categorical-variable-range-to-plot-on-bar-graph

评论： Nex 2021-10-4

I don't understand why the categorical data is shown in its entirety on the graph despite only a portion of it being selected.

Am I indexing it wrongly?

C = categorical({'A'; 'B'; 'C'; 'D'; 'E'; 'F'});
N = [5 4 2 3 4 8];
bar(C(3:end), N(3:end))

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Siddharth Bhutiya 2021-10-4

在 MATLAB Online 中打开

When you create a cateogorical array, you specify the list of categories. That list now becomes a property of the categorical object. Taking a subset of the array using indexing would not update that list. If you want to add/remove a category from your array then you would have to use something like addcats/removecats.

>> C = categorical({'A'; 'B'; 'C'; 'D'; 'E'; 'F'});
>> categories(C)
ans =
  6×1 cell array
    {'A'}
    {'B'}
    {'C'}
    {'D'}
    {'E'}
    {'F'}
>> C1 = C(3:end)
C1 = 
  4×1 categorical array
     C 
     D 
     E 
     F 
>> categories(C1)
ans =
  6×1 cell array
    {'A'}
    {'B'}
    {'C'}
    {'D'}
    {'E'}
    {'F'}