Autodesk 256B1-05A761-1301 - AutoCAD Revit Structure Suite 2010 User Manual page 413

Changing the number of elements in an array
Specifying how elements are added to or removed from an array
When you change the number of elements in an array, you can specify how the additional elements are
added to (or removed from) the array.
1 Select the array.
An array is selected when the line that indicates the layout is selected, as shown in the following image.
2 On the Options Bar, select or clear the Append to End check box.
If Append to End is selected, the spacing between the elements in the array remains the same, and
any elements you add to (or remove from) the array are added to (or removed from) the existing
endpoint of the array.
Array selected
Number of elements in the array changed with Append to End selected
If Append to End is not selected, the endpoints of the array remain the same, and any elements
added to (or removed from) the array are evenly spaced in between the existing endpoints.
Array selected
Changing an Array | 371