How to use a for cycle for opening .mat files

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Hi,
In the directory c:\MAT (it's not my workspace directory), I have the following .mat files:
A1B1.mat
A1B2.mat
A1B3.mat
A2B1.mat
A2B2.mat
A2B3.mat
A3B1.mat
A3B2.mat
A3B3.mat
How can I automate the opening/import of them, for example, using a for cycle, saving each .mat file in a new variable?
Best regards,

Accepted Answer

Stephen23
Stephen23 on 8 Feb 2022
Edited: Stephen23 on 8 Feb 2022
The general concept is shown here:
You can easily store the imported data in the same structure as DIR returns, e.g.:
P = 'C:\MAT';
S = dir(fullfile(P,'*.mat'));
for k = 1:numel(S)
F = fullfile(P,S(k).name);
S(k).data = load(F);
end
All of the imported file data will be stored in the structure S. For example, for the second file:
S(2).name % filename
S(2).data % structure of the imported data
If each file contains exactly one variable of the same name then you can simplify the later processing by specifying that variable when importing:
P = 'C:\MAT';
S = dir(fullfile(P,'*.mat'));
for k = 1:numel(S)
F = fullfile(P,S(k).name);
T = load(F);
S(k).data = T.nameOfTheVariable;
end
Note that after then loop you can use this syntax, which might make processing your data easier:
  2 Comments
Stephen23
Stephen23 on 9 Feb 2022
"Now, if I would like to load each .mat file that your code originates into a variable"
They are already in a variable, the structure S. You can access them simply and efficiently using indexing.
If you want each file loaded into a separate, dynamically named variable, you might like to read this:

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More Answers (1)

Image Analyst
Image Analyst on 9 Feb 2022

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