concatenating several mat file into one

Question

Navid 2014-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/125602-concatenating-several-mat-file-into-one

评论： Navid 2014-4-14

Hi,

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

all of these files have the same content like: variable1<3400x1 double> , variable2<1143x1 double> , variable3<1141x1 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.

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Answer 1

dpb 2014-4-13

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https://ww2.mathworks.cn/matlabcentral/answers/125602-concatenating-several-mat-file-into-one#answer_133236

在 MATLAB Online 中打开

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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Navid 2014-4-14

在 MATLAB Online 中打开

Many thanks for your help.As a beginner your hint gave me the idea, I added some line and now it's working.

clear
PathName        = uigetdir;
file_all        = dir(fullfile(PathName,'*.mat'));
matfile        = file_all([file_all.isdir] == 0); 
clear file_all PathName
%d=dir('*.mat');  % get the list of files
x=[];            % start w/ an empty array
for i=1:length(matfile)
x=[x; load(matfile(i).name)];   % read/concatenate into x
end
b=[];
for j=1:length(x)
    b=[b; x(j, 1).variable1];
end
FileName = [matfile(i,1).name(1:end-9),'.mat'];
save(FileName,'matfile','x','b');