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(ssdel entity-name selection-set)

Erase it from the selection set.

This function deletes the entity, entity-name, from the selection set, selection-set. Unlike the ssadd function, entity-name and selection-set are not optional.

If entity-name is part of the selection set, ssdel deletes it and returns the selection set. If it is not part of the selection set, a nil is returned.


Code Comments
(setq sset1 (ssget)) Creates a new selection set called sset1.
(setq ent1 (entnext)) Finds the first entity in the drawing and sets it to ent1.
(ssadd ent1 sset1) Adds ent1 to sset1
(ssdel ent1 sset1) Deletes ent1 from sset1.
(ssdel ent2 sset1) Assuming ent2 is set to an entity(not in sset1), a nil would return.

(entnext [entity-name])

(setq symbol1 statement1 [symbol2 statement2] ...)

(ssget [mode] [point1 [point2]] [point-list] [filter-list])

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Programming Overview of LISP (LISt Processing) Language

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