How to create two different sets of images from one set of images using indexing?

I have a set of 100 images with dimensions 1000×500×100 where 100 is pixel per A- line, 500 lines per frame. Lets say I index them in code using i = 1:100. So I need to make two stacks of images one having i=1,2 is in stack 1 then i=3,4 goes in stack 2. Then again i =5,6 goes in stack 1 and then i=7,8 goes in stack 2. This way i want to distribuyte the hundred images. The code I use to aquire the images is shared below.

Thank You for helping me.

tic, clear all; close all; clc;
Adrs=uigetdir('\.','Select Folder for Phase image');
file_name=dir(fullfile(Adrs,'*.bmp'));
total_num=numel(file_name);

h = waitbar(0,'Reading Phase image files.... Please Wait'); 

for I=1:total_num
 file1=fullfile(Adrs,file_name(I).name);
img_phs(:,:,I)=(imread(file1));
waitbar(I/total_num,h);
end
close(h)

Answer 1

[Rohit]

Example:

I am assuming the “data” to be consisting of 10 frames of 5*5 black and white images and then I distribute them into 2 sets (“set1”, ”set2”) based on indexing. The code for the same is below:

Code:

data=randi(20,5,5,10);
frame=data(:,:,1);

Indexing frames

index1=[1,2,5,6,9,10];
set1=data(:,:,index1);

index2=[3,4,7,8];
set2=data(:,:,index2);

Below is the documentation to help with array and matrices creation and manipulation:

Matrices and Arrays - MATLAB & Simulink (mathworks.com)

[Sweta]

Thank You so much Rohit for getting back to me , but for huge stacks of images like 200 or 300 images , I can write all the index numbers, also if want to take every 3rd alternative image instead of one alternative image, this function wont be applicable. Thats why I need more dynamic code with variables where I can put the no. of total frames and just put the index by which I need seperation.....like "3" i.e. first 3 images in stack 1 then next three images in stack 3.

Thank you again for your help and your time