How to select the first i columns of a matrix?

Hello, I have a nxn matrix X. I need to select the first i columns alone of the matrix within a for loop. How can I do this? I'm not able to figure out the indexing for this. This is what I want

X =

     -1.5145   -1.5475   -1.5556
     -1.4254   -1.4856   -1.5085
     -1.3363   -1.4237   -1.4614
first iteration
 -1.5145
 -1.4254
 -1.3363 
second iteration
-1.5145   -1.5475 
-1.4254   -1.4856
-1.3363   -1.4237

[M]

Maybe you should start by reading how to write for loop and read about indexing matrices in matlab.

[Stephen23]

A good place to learn basic (and important!) MATLAB concepts is by doing the introductory tutorials, which are highly recommended for all beginners:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

These will teach you many important concepts that you need to know.

Answer 1

[Birdman]

for i=1:size(X,2)
   X(:,1:i)
end

[SSG_newbiecoder]

@Birdman: Thank you