MATLAB: Data in subfolder cannot be load

3ddatadata importMATLABtextscan

Hello, I'm using Matlab R2015b and having problem in reading all data from few sub folders. The folder/dir can be detected but it do not read/extract my data which is in form of '.DATA' and it is quite large data files. In each .DATA, the data is separated with space. I try to fix my coding but still the data cannot be read. I hope anybody can help me on where should i fix my code. I appreciate any help from you guys, thanks.
Here is the code:
 f=dir(strcat(folderdir,'*.DATA'));
    p={f.name};  
    temp = {};
    for k=1: numel(p)
      file= strcat(folderdir,p{k});
      fid=fopen(file);
      b=textscan(fid,'%f %f %f','delimiter',' ');
      fclose(fid);
      x=b{1};
      y=b{2};
      z=b{3};
      data{k}=dataset(x,y,z);
      temp{k}=data{k}; 
    end
    set{j-2} = temp;
    setname{j-2} = foldername;  
end

Best Answer

We recommend using fullfile(folderdir, '*.DATA') and fullfile(folderdir, p{k}) instead of strcat .
You should replace
fid=fopen(file);
with
 [fid, msg] = fopen(file, 'r');
 if fid < 0
    error('Cannot open file "%s" because "%s"', file, msg);
 end
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