The docs don't say explicitly, but the presence of a SORT object - which is a Set object with this comment: " This object however holds the IDs in a prescribed order - normally the order they were added to the object"... suggests the SET object does store your added entities in numerically increasing order. Besides... here's some test code which proves an feSet stores the ID's in numerically increasing order, not the order in which you select them. I haven't tried what happens if you have two selection operations without clearing the set in between - you can modify and test:
The HTML Clipboard
Sub Main Dim App As femap.model Set App = feFemap() Dim SetObject As femap.Set Set SetObject = App.feSet Dim nID As Long rc = SetObject.Select(FT_NODE,True, "Select nodes in non-numeric order") If rc<>-1 Then Exit Sub End If While SetObject.Next() nID=SetObject.CurrentID() App.feAppMessage(FCM_NORMAL, "Node ID is " + Str$(nID)) Wend End Sub
Set objects are just a list of IDs...always stored in sorted order. You can traverse them in either direction using Next() or Prev(), but internally they are stored from lowest to highest. Sort objects can contain additional information that you can sort in various ways. Prior to sorting however, they are stored in the order you created them.