How Can I read the contents of .mat files ?

Question

farzad 2014-10-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/158156-how-can-i-read-the-contents-of-mat-files

评论： Walter Roberson 2025-9-19

Hi All

I have an m file and a set of .mat files that are connected to this m file and m file loads their data , I need to know whether I can open and extract all the data of these .mat files and check what they contain

thank you very much

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Answer 1

Azzi Abdelmalek 2014-10-10

3
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https://ww2.mathworks.cn/matlabcentral/answers/158156-how-can-i-read-the-contents-of-mat-files#answer_154679

在 MATLAB Online 中打开

data=load('your_file_name')

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farzad 2014-10-10

Thanks a lot Azzi

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Answer 2

Star Strider 2014-10-10

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https://ww2.mathworks.cn/matlabcentral/answers/158156-how-can-i-read-the-contents-of-mat-files#answer_154683

You can check the contents of .mat files and load specific data from them with the matfile function.

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Star Strider 2025-9-18

@Hakan -- My pleasure!

Walter Roberson 2025-9-19

在 MATLAB Online 中打开

There is a limitation, that matfile() cannot be used with -v4 .mat files.

vers = ["v4", "v6", "v7", "v7.3"];
nvers = length(vers);
rng(12345);
data = randi([0 255], 1, 50, 'uint8');
for K = 1 : nvers
    v = vers(K);
    fname = "data_" + v + ".mat";
    save(fname, "data", "-" + v );
    try
        whos('-file', fname);
    catch ME
        fprintf('error doing whos for "%s"', fname);
    end
    try
        obj = matfile(fname);
        whos(obj);
    catch ME
        fprintf('error doing matfile for "%s"', fname)
    end
end
Warning: Variable 'data' was not saved. For variable of type 'uint8' use MAT-file version 6 or later.
error doing whos for "data_v4.mat"
error doing matfile for "data_v4.mat"
  Name      Size            Bytes  Class    Attributes

  data      1x50               50  uint8              
  Name      Size            Bytes  Class    Attributes

  data      1x50               50  uint8              
  Name      Size            Bytes  Class    Attributes

  data      1x50               50  uint8              
  Name      Size            Bytes  Class    Attributes

  data      1x50               50  uint8              
  Name      Size            Bytes  Class    Attributes

  data      1x50               50  uint8              
  Name      Size            Bytes  Class    Attributes

  data      1x50               50  uint8              