convert a struct to a mxn cell array

Question

yan abr 2017-11-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368891-convert-a-struct-to-a-mxn-cell-array

评论： yan abr 2017-11-25

hi,

Let say i have 6 files: 101 ... 103 and 201 ... 203 which represent 2 people (p) with 3 different expressions(e). After using 'dir' to gel all the files, i try to create a cell (2x3). However i got an error ' Improper index matrix reference '. Below is the code:

FolderTrain = 'myfolderpath'; %specify the folder 
AllTrainFiles = fullfile(FolderTrain, '*.txt'); % get the directory path for all files
myData = dir(AllTrainFiles);
for i=1:length(myData)     
      j=2;
      k=3;
      TrainData = cell(j,k);
end

cell

for p = 1:j
    for e = 1:k
       baseTrainFilename = {TrainData(p,e).name};
       TrainFilename = fullfile(FolderTrain, baseTrainFilename); 
       fid = fopen(TrainFilename);
       A = fscanf(fid, '%d %d %d');
       TrainData{p,e} = A;
       fclose(fid);
    end
end

How can i create a correct 2x3 cell? Thank you.

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Walter Roberson 2017-11-23

在 MATLAB Online 中打开

Why are you running the body of

for i=1:length(myData)     
      j=2;
      k=3;
      TrainData = cell(j,k);
end

more than once? It always assigns the same content to the variables.

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Answer 1

dpb 2017-11-23

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/368891-convert-a-struct-to-a-mxn-cell-array#answer_292843

编辑：dpb 2017-11-24

在 MATLAB Online 中打开

FolderTrain = 'myfolderpath';                % specify the folder 
AllTrainFiles=fullfile(FolderTrain,'*.txt'); % full path wild card pattern for all files
d=dir(AllTrainFiles);                        % directory list for all files
for i=1:length(d)          % iterate over files; Matlab does return sorted order
  data{i}=importdata(fullfile(FolderTrain,d(i).name));  % read each file as array into cell
end
data=reshape(data,3,2);           % rearrange as 2 columns, 3 rows by sequential order

The above presumes the data files are numeric arrays as would be implied by the format string used in the fscanf call.

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dpb 2017-11-24

编辑：dpb 2017-11-24

在 MATLAB Online 中打开

From the original lines

baseTrainFilename = {TrainData(p,e).name};
TrainFilename = fullfile(FolderTrain, baseTrainFilename);

I'd pasted the fullfile() argument text into the place where the .name was used to pick it up to eliminate the unneeded temporary; unfortunately it was inside the existing curlies...old eyes and all that make them hard to tell apart... :(

yan abr 2017-11-25