MATLAB: Taking the average of data from 500 different files

exportfor loop

Hi,

I have 500 different files in sequential filenames in the following format: datafile_XX.mat

All of these files contain a matrix that is of size n x 8. n is changing per file. but there are 8 columns total.

I want to take the average of the first 400 rows of each file. How do i load all of these files efficiently?

Best Answer

for ni = 1:500
  filename = sprintf('datafile_%03i.mat',ni);
  load(filename)
  % Process your stuff here
end

Related Solutions

MATLAB: Load multiple .mat file and do same calculation on each file

Your code works only for A00001 because you set 'A00001' as input arguments for GQRS, RDANN, RDSAMP. Change the numbers with index i.

for i=1:5
    str = 'A000' num2str(i,'%02d');
    filename = [str, '.mat']
    load(str); 
      % calculations 
      N = 9000; 
      gqrs(str, N); 
      ann = rdann(str, 'qrs', [], N); 
      [tm,sig] = rdsamp(str, [], N); 
  end

Also, if you breakdown the problem, you can easily find which part you need to change.

Made the maximum loop index smaller from 100 to 5.
To check the mat-file was loaded correctly, created the variable, filename.
Since the first loading part worked correctly, checked the second part.

MATLAB: How to load a .mat file from the parent directory

you can determine your current directory with pwd.

so to load the file it'll go something like this

 myfile = 'mymatfile.mat';
 [parentdir,~,~]=fileparts(pwd);
 load(fullfile(parentdir,myfile))

Best Answer

Related Solutions

MATLAB: Load multiple .mat file and do same calculation on each file

MATLAB: How to load a .mat file from the parent directory

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