MATLAB: How to delete row or column in x.mat file

Question

Hi,

I have a X.mat file, its big mat file.

how can i delet the rows ( specific row ) !! for example;

row : 600 to 3000 delete

or column 25 to 35 delete

I tried The code below but did not work :

X = importdata('X.mat'); 
X([501,2000],:) = [];

Answer 1

Does X.mat file only have one variable? In that case, try

X(501:2000,:) = [];
    %^ put : here

Also, If the variable is very large, then it may be faster to modify the mat file without loading directly

data = matfile('X.mat', 'Writable', true);
data.X(501:2000,:) = [];