If I interpret your question correctly, you have two MAT-files containing the same variable names, but with different data, and you want to concatenate the data from each file into a new variable (with, again, the same name). For example, MAT-file #1 contains A = [1,2,3,4] and MAT-file #2 contains A = [6,7,8,9]. You want to write MAT-file with A = [1,2,3,4;6,7,8,9]. Yes?
If so,
x = load('file1');
y = load('file2');
x and y are now structures with fields given by the variable names in the MAT-files (such as x.A).
% Concatenate
x.A = [x.A;y.A];
Then save out again:
save('file3','-struct','x');
Here's a general version that doesn't care what the variables are called, as long as they're the same in each file (and they can be concatenated vertically):
% Create example data
A = magic(4);
B = magic(3);
save('ECU_1','A','B');
A = [3,2,4,1];
B = [7,8,9];
save('ECU_2','A','B');
clear('A','B')
% Combine data from two MAT-files
x = load('ECU_1');
y = load('ECU_2');
% Check to see that both files contain the same variables
vrs = fieldnames(x);
if ~isequal(vrs,fieldnames(y))
error('Different variables in these MAT-files')
end
% Concatenate data
for k = 1:length(vrs)
x.(vrs{k}) = [x.(vrs{k});y.(vrs{k})];
end
% Save result in a new file
save('ECU_A','-struct','x')
