How to assign corresponding label to dataset

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婧怡王 2021-6-30

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https://ww2.mathworks.cn/matlabcentral/answers/869188-how-to-assign-corresponding-label-to-dataset

评论：婧怡王 2021-7-2

I have loaded a dataset, there are three classes as follows:

and I need to have the corresponding label set in order to training data with LSTM, but I don't know how to get a N*1categorical array like this:

How can I do this? I really need your help.

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Answer 1

Seth Furman 2021-7-1

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https://ww2.mathworks.cn/matlabcentral/answers/869188-how-to-assign-corresponding-label-to-dataset#answer_737198

在 MATLAB Online 中打开

We can create categorical arrays using the categorical function.

https://www.mathworks.com/help/matlab/ref/categorical.html

Assuming SR, VF, and VT are cell arrays of character vectors we can call categorical with a value set. For example,

% Example data
SR = {'N','A','N','N'};
VF = {'N','N','N'};
VT = {'A','N'};
% Convert SR, VF, and VT into categorical arrays
valueset = {'N','A'};
SR = categorical(SR,valueset)
SR = 1×4 categorical array
     N      A      N      N 
VF = categorical(VF,valueset)
VF = 1×3 categorical array
     N      N      N 
VT = categorical(VT,valueset)
VT = 1×2 categorical array
     A      N 

Assuming SR, VF, and VT are NOT cell arrays of character vectors, but can be concatenated, we can call categorical with a value set and a set of corresponding category names. For example,

% Example data
SR = {0,1,0,0};
VF = {0,0,0};
VT = {1,0};
% Convert SR, VF, and VT into categorical arrays
valueset = [0 1];
catnames = {'N','A'};
SR = categorical([SR{:}],valueset,catnames)
SR = 1×4 categorical array
     N      A      N      N 
VF = categorical([VF{:}],valueset,catnames)
VF = 1×3 categorical array
     N      N      N 
VT = categorical([VT{:}],valueset,catnames)
VT = 1×2 categorical array
     A      N 