How Can I read the contents of .mat files ?

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

Answer 1

[Azzi Abdelmalek]

data=load('your_file_name')

[farzad]

Thanks a lot Azzi

Answer 2

[Star Strider]

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

[farzad]

thank you very much

[Hunt3r5o4]

Thanks

[Star Strider]

@Hakan -- My pleasure!

[Walter Roberson]

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              

Answer 3

[Nelson]

data=load('fun')

Answer 4

[Hunt3r5o4]

You can use

matObj = matfile("path");

This gives all the variables within the .mat file.

variable = matObj.variable;

This gives you a specific variable within the .mat file.

disp(variable);

This will display the variable.