List Manipulation with LISP

In this article we will discuss how to process the List in Lisp. As you are probably well aware, LISP stands for "List Processing".

A list is a group of elements consisting of any data type and is stored as a single variable. A list can contain any number of Reals, Integers, Strings, Variables and even other Lists. Let's have a look at a list. Type this :

(setq pt1 (getpoint "\nChoose a Point : "))

AutoLisp should return something like this : (127.34 35.23 0.0)

Now what do I do with the list? AutoLisp has many functions available to manipulate lists. Let's have a look at them.

Car

The primary command for taking a list apart is the "Car" function. This function returns the first element of a list. (The x coordinate.)

For example :

(setq a (car pt1))