Extracts columns using functions
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Anurag Agrawal on 30 Mar 2020
Your question sounds incomplete. However from my understanding, you can use matfile function to access and change variables in MAT-file without loading file into memory.
For example, if you have matrix a saved in abcd.mat, you can access it using:
myObj = matfile('abcd.mat');
Then you can access 3rd column like
x = myObj.a(:,3);