Ant Colony Optimization and edge detection explanation request.

Sir, I referred your program for edge detection using Ant Colonly Optimization. There are some functions that I couldnt understand. I request you to please explain the following code??

 rand('state', sum(clock));
    temp = rand(ant_total_num, 2);
    ant_pos_idx(:,1) = round(1 + (nrow-1) * temp(:,1)); 
    ant_pos_idx(:,2) = round(1 + (ncol-1) * temp(:,2));

Answer 1

[Image Analyst]

Which function, rand(), sum(), or round() do you not understand, even after looking it up in the help?