There are many ways to approach this.
First get the position of your GUI f = figure('Position',[300 300 300 200]);
Set the desired position you want
set(handles.figure_main,'Units', 'pixels');
set(handles.figure_main,'Position', [900 39 912 600]);
If you want to move the gui in horizontal and vertical direction you can set it in for loop and enter the desired values you want to increment. For eg you want to move horizontal from 0 to 100. Put these values in temp variable and increment it by one. Regarding speed I'm not sure what exactly u meant. But if you want user to change the speed then you can a put a pause(a); in for loop. Where a would the delay before updating to new position. So if a is very less like 0.1. It will update its position fast and if a is 1 then it will be slow. This method will give overall control of the speed.
