Defines
a function
(defun sym ([arguments] [/ variables...]) expr...)
Arguments
- sym
-
A symbol naming the function.
- arguments
-
The names of arguments
expected by the function.
- / variables
-
The names of one or more
local variables for the function.
The slash preceding the
variable names must be separated from the first local name and from
the last argument, if any, by at least one space.
- expr
-
Any number of AutoLISP
expressions to be evaluated when the function executes.
If you do not declare
any arguments or local symbols, you must supply an empty set of
parentheses after the function name.
If duplicate argument
or symbol names are specified, AutoLISP uses the first occurrence
of each name and ignores the following occurrences.
Return Values
The result of the last
expression evaluated.
WarningNever use the name of a built-in function
or symbol for the sym argument to defun. This overwrites
the original definition and makes the built-in function or symbol
inaccessible. To get a list of built-in and previously defined functions,
use the atoms-family function.
Examples
(defun myfunc (x y) ...) Function takes two arguments
(defun myfunc (/ a b) ...) Function has two local variables
(defun myfunc (x / temp) ...) One argument, one local variable
(defun myfunc () ...) No arguments or local variables
