MATLAB: Concatenating several mat file into one

concatenate several math file with same contentMATLAB

Hi,

I have several mat file like: first.mat ,second.mat ,third.mat,…

all of these files have the same content like: variable1<3400×1 double> , variable2<1143×1 double> , variable3<1141×1 double> , …

all mat files have the same content but the size of each variable in each mat file is different. I need to concatenate all same variables in all mat files in order to have just one mat file.

can somebody tell me what can I do?which function should I use?

Many thanks.

Best Answer

Presuming by "math" files you mean a Matlab .mat file,

d=dir('*.mat');  % get the list of files
x=[];            % start w/ an empty array
for i=1:length(d)
x=[x; load(d(i).name)];   % read/concatenate into x
end
save('newfile.mat',x)

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MATLAB: Load multiple .mat files

Yes, you can't concatenate structures (the output of load) with different field names, which will always be the case with load. You can however easily concatenate tables with different columns names, so converting that structure in the loop to a table would work:

    pathname        = uigetdir;
    allfiles        = dir(fullfile(PathName,'*.mat'));
    matfiles        = allfiles([allfiles.isdir] == 0);   %probably not needed since it's unlikely that a xxx.mat is a directory
    fulltable = table(); 
    for fileid = 1:numel(matfiles)
       [~, filename] = fileparts(matfiles(fileid).name);
       filetable = struct2table(load(fullfile(pathname, matfiles(fileid).name))); 
       filetable.Properties.VariableNames{2} = filename;  %rename 2nd variable
       fulltable = [fulltable, filetable(:, 2)];  %only copy second variable
    end

MATLAB: MAT files

p=load matfile1.mat
q=load matfile2.mat
save newmatfile.mat

Best Answer

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MATLAB: Load multiple .mat files

MATLAB: MAT files

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