Lisp length of list. , chains of cons cells.

Lisp length of list. I typically have a list that Share length (AutoLISP) Returns an integer indicating the number of elements in a list Supported Platforms: Windows and Mac OS (zerop (length (make-list 5000000))) ;=> nil 同様のアイディアとして、Paul Graham著の On Lisp にsingleという例があります。要素が1つならば真を返しますが、長さではなく、1つ目の要素の後が終端 (nil)かどうかを判定しています。 (defun single (lst) (and (consp lst) (not (cdr lst)))) Feb 21, 2011 · The longer the list, the longer it takes to find length or search items. (nth 2 ' (1 2 3 4)) ⇒ 3 (nth 10 ' (1 2 3 4)) ⇒ nil (nth n x) ≡ (car (nthcdr n x)) Dec 2, 2016 · It seems that you don't want to count the length, but the number of atoms (the leaves in the tree) of a given list. Elements are numbered starting with zero, so the CAR of list is element number zero. 7. If sequence is a vector with a fill pointer, the active length as specified by the fill pointer is returned. list-length differs from length when the list is circular; length may fail to return, whereas list-length will return nil. List Functions (Common Lisp Extensions)11. To do it, you want to define a function that will check if the argument is an atom or a list. ), also known as trees. In the first case it will return 1 (the number of atoms in an atom). apep w6 ip8op i8jgxi zw2j v2w jjma ouk 1xusx spwwy