Hi have this code in a routine I got from the internet, I know what it does but I don't understand it... Could someone explain?
Thanks a lotCode:(defun C:sumlp (/ p l e sxy exy sum) (setq p (ssget (list (cons -4 "<or") (cons 0 "LINE") (cons 0 "LWPOLYLINE") (cons -4 "<and") (cons 0 "POLYLINE") (cons -4 "<not") (cons -4 "&") (cons 70 (+ 16 32 64)) (cons -4 "not>") (cons -4 "and>") (cons -4 "or>") ) ) sum 0.0 )