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# creating an ongoing matrix

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Elaheh on 8 Oct 2019
Closed: MATLAB Answer Bot on 20 Aug 2021
Hello
The following simple script is going to merge two or three files and then calculate the mean of every n columns in a for loop. What I need to do is to create a new matrix as the number of averaged columns is added to the matrix one by one and write the resluts in an excel file. Thank you a lot in advance.
path='D:\';
fileName1=strcat(path,'Se1_101_200.xlsx'); %23*35 double
fileName2=strcat(path,'Se1_201_300.xlsx'); %23*35 double
mergedData1=[data1 data2]; %23*70 double
for i=1:35
for ii=36:70
B = mergedData1(:,[i ii]);
meanVal= mean(B,2);
% I need to create a matrix of 23*35 with the changing meanVal
end
end
Bob Thompson on 9 Oct 2019
Hmm, ok, I think I better understand what you're trying to do now. Just to reiterate though, you want the average of the first columns of each data set (columns 1 and 36) and then the average of the second columns of each data set (columns 2 and 37), but not the average of the non-corresponding columns (columns 1 and 37).
for i = 1:size(mergedData1,2)/2
B = mergedData1(:,[i i+size(mergedData1,2)/2]);
meanVal(:,i) = mean(B,2);
end