how to extract corresponding file name from recognized index

Question

yan abr 2017-12-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/372487-how-to-extract-corresponding-file-name-from-recognized-index

评论： yan abr 2017-12-12

I have the following code:

distances = pdist2(TE,TR);   %testing sample(TE) and training sample(TR)
[Euc_dist_min , Recognized_index] = min(distances,[], 2)

From the above code, i got the min distance and corresponding index. For example i have 3 faces for testing and 6 faces for training:

Euc_dist_min =
     23.4417
     25.2491
     20.4378
Recognized_index =
     1
     4
     5

How can i get the corresponding file names that represent those index.I name them as 0101,0102,0103,0201,0202,0203(.txt).I use

for k=1:length(Recognized_index)
    OutputFileName = Recognized_index(k).name
end

but i got an error 'Struct contents reference from a non-struct array object'. My training files obtained as follows:

FolderTrain = 'D:\train';  
AllTrainFiles = fullfile(FolderTrain, '*.txt'); 
TrainFiles = dir(AllTrainFiles);
for i=1:length(TrainFiles)     
    baseTrainFilename = (TrainFiles(i).name);
    TrainFileName = fullfile(FolderTrain, baseTrainFilename);
    fid = fopen(TrainFileName); 
    A{i} = fscanf(fid, '%d %d %d');
    fclose(fid);
end

Thank you.

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Answer 1

KL 2017-12-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/372487-how-to-extract-corresponding-file-name-from-recognized-index#answer_295859

在 MATLAB Online 中打开

Your code snippets are quite unclear but if you want to index certain elements from the dir output, that's just like indexing anything else on matlab. For example if you want to extract only 1st, 3rd and 5th filenames from the struct

OutputFileNames = {TrainFiles([1 3 5]).name};

if you want to use Recognized_index there,

OutputFileNames = {TrainFiles(Recognized_index).name};

Is this what you want?