MATLAB: Concatenate 3 dimensional matrix in a loop

Question

I have 128 matrices( n*32) stored in a dataStructure. I want to concatenate these matrices in 3 dimensional so its possible for me to calculate the mean in the third dimension.

for fileNr =1:nrOfFiles outputFileName = outputFileNames(fileNr); outputFileName = outputFileName{1}; outputFileName = strcat(outputFolder, filesep, outputFileName);

    FileName=(outputFileName);
    data=load(FileName)
    data=data2.dataStruct.data

end

i wrote a code like this to get the data from the data structure. how do i concatenate the matrices(in data) after every loop using cat function.

Answer 1

Hi,

you can concatenate like follows in the loop

allData(:,:,fileNr) = data;

but if you "only" want to compute the mean, there is no need to blow up the memory like this, simply do: in the loop

if fileNr == 1
  meanData = data;
else
  meanData = meanData + data;
end

and after the loop

meanData = meanData / nrOfFiles;

Titus