Read c3d-files into Matlab

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Sam 2014-12-24

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https://ww2.mathworks.cn/matlabcentral/answers/168010-read-c3d-files-into-matlab

回答： Walter Roberson 2023-5-24

I have two directories of data: 'data_stair_rise' and 'data_sts'. Each directory contains 5 subfolders: 'pp1', 'pp2', 'pp3', 'pp4' en 'pp5'. Each subfolder contains some '.c3d-files'. (see attachment).

We need to read these files into Matlab. The teacher gave us a function who can read these c3d-files, but we need to create 5x5 struct (5 subjects x 5 measurements). (see attachment).

I don't have ANY idea how to start... Please help.

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Suad Abu Shaar 2023-5-24

Can you share the command used to read the c3d file please

Image Analyst 2023-5-24

@Suad Abu Shaar, @Sam had a function he called "read_c3d_file" but he never attached it. And since it's 9 years later, I doubt he ever will.

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回答（2 个）

Image Analyst 2014-12-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/168010-read-c3d-files-into-matlab#answer_163270

I don't know what's in the file. In a single .c3d file, how many subjects, and how many measurements are in it?

When you use your teacher's function, what kind of variable does the file get read in to? A single structure? An array of structures? We have no idea, but you should since you and your teacher have the code.

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Sam 2014-12-25

在 MATLAB Online 中打开

Indeed, this creates the 5x5struct that I want (a 5x5 struct and each cell is also a struct containing the 6 datafiles). But the problem is now that each cell (=1x1struct) of the 5x5struct (=sa) is the same...

This is my code:

aantal_proefpersonen = length(dir('data_stair_rise'))-2
for welke_pp=1:aantal_proefpersonen
  myFolder =sprintf('data_stair_rise/pp%c',num2str(welke_pp));
      filePattern = fullfile(myFolder,'*.c3d');
c3dFiles = dir(filePattern);
for i_files=1:length(c3dFiles);
   baseFileName = c3dFiles(i_files).name;
   fullFileName = fullfile(myFolder, baseFileName);
   [VideoSignals,VideoSignals_headers,AnalogSignals,AnalogSignals_headers,AnalogFrameRate,VideoFrameRate] = read_c3d_file(fullFileName)
for col = 1:length(c3dFiles)
for row = 1:aantal_proefpersonen
  sa(row, col).VideoSignals = VideoSignals; % Whatever this is.
  sa(row, col).VideoSignals_headers = VideoSignals_headers; % Whatever this is.
  sa(row, col).AnalogSignals = AnalogSignals; % Whatever this is.
  sa(row, col).AnalogSignals_headers = AnalogSignals_headers; % Whatever this is.
  sa(row, col).AnalogFrameRate = AnalogFrameRate; % Whatever this is.
  sa(row, col).VideoFrameRate = VideoFrameRate; % Whatever this is.
end
end
end
end

What should I do so that each cell is not the same?

Sam 2014-12-25

编辑：Sam 2014-12-25

Thanks, I understand that. But where exactly should I place 'reac_c3d_file()' to solve the problem? I tried different things, I replaced 'read_c3d_file()' but I still don't get the result I want...

Sam 2014-12-26