LISP - Function List

• Introduction to Lisp and Lisp Concepts
• Download Lisp Interpreters
• Using an interpreter
• Lisp Keywords and Built-in Functions & Macros
  • Common Primatives
  • Conditional Statements
  • Mathmatical Operators
  • Alphabetic List of Functions(this page)
• Code and Programs
• Books
• Links and Resources

Alphabetic List of Functions
Also called Operators, Macros and Primitives

ABS - Absolute Value (ABS -5)
5

APPEND Merges lists

(APPEND `((A B)(C D)))
Answer  (A B C D)

ATOM Tests an argument to see if it is an atom

(ATOM `(A B C D))
Answer  NIL
(ATOM `A)
Answer  T

CAR Takes the first element of list

(CAR `(ONE TWO))
Answer  ONE

CDR Remove the first element of list

(CDR `(ONE TWO THREE))
Answer  TWO THREE

CONS Adds a new first element to a list

(CONS `A (Q Z))
Answer  (A Q Z)

"DEFine FUNction", use DEFUN to create custom procedures DEFUN Creates user defined functions
Example: (DEFUN ADD2 (x y) (+ x y))
Creates a function called ADD2 that takes two parameters x and y and adds them. To use:
(ADD2 3 4)
Answer  7

EVAL Evaluates and expression:
(EVAL NUMBER)
23

EXPT - Calculates Powers (EXPT 3 2)
9

LIST Makes a new list of several lists

(LIST `((A B)(C D)))
Answer  ((A B)(C D))

LISTP Tests an argument to see if it is a list

(LISP `(A B C D))
Answer  T
(LISTP `A)
Answer  NIL

LOAD or :LD Loading a saved script into the interpreter.

MEMBERP Tests to see if an ATOM is a member of a list.

MAX - Largest number in sequence (MAX 2 5 6)
5

MIN - Smallest number in sequence (MIN 2 5 6)
2

NULL Tests to see if an argument is an empty list

(NULL '())
Answer  T
(NULL '(A B C))
Answer  NIL

NIL Universal false.
Boolean response for "false"

QUOTE Prints list item(s)

(QUOTE `(COLORS))
Answer  YELLOW RED GREEN

SETQ Assigns values:
(SETQ NUMBER `32)

Associates a list with a list name:
(SETQ COLORS `(YELLOW RED GREEN))


SQRT - Square Root (SQRT 16)
4.0

T Universal true.
Boolean response for "true"