How do I add an additional matrix to be a variable in multpile matfiles?

Hello! I have some matfiles to analysis and I have to add a new matrix to be a variable in one file. Like the below images show, I have to add an additional matrix 'lab' to the '0631312_s1.mat' (the second image), make it same like '0631312_1.mat' (the first image) and the matrix is a 512x512 null-matrix, like the third image.

I know we can use function zeros(n) to build a n x n null matrix, but what should I do to assign an additional matrix to be a variable in multiple matfiles automatically? Please suggest and thank you for helping me!

Answer 1

[Biral Pradhan]

I understand, you want to append an additional matrix as a variable in multiple MAT-files automatically. I assume you have multiple MAT-files created already. First of all, I recommend saving these files in a single directory.

Once done, kindly refer the below script.

matfiles = dir('<filepath>\*.mat'); %e.g. dir('C:\Users\*.mat')
x = zeros(512,512); %512-by-512 null matrix
 
N = length(matfiles) ;  
for i = 1:N
    save(matfiles(i).name, 'x', '-append')
end

This should append the variable 'x' to all the MAT-files in present your directory.

[KuanTing Wu]

Hello, sorry for the late reply. I have solved this problem in another way a few days ago, but still appreciate your suggestion!