If you have upgraded AutoCAD 2013 and you’re using the good old classic view, then you may have found that the Array dialog box doesn’t appear on screen.
AutoCAD Classic View
Clicking on the Rectangular/Path/Polar Array only allows you to control the object(s) being arrayed, which for example number of columns is 5 the screen will update automatically.
If you’re not happy with just following the command line you can still use the Array dialog box but you need to type ‘ARRAYCLASSIC’ into the command line.
Another solution is to switch the default Drafting & Annotation workspace and selecting the Array tools from the Ribbon, it will switch the Ribbon to the Contextual Ribbon>Array Creation. This will have all the features you have in the array dialog box and more.