Lambda / Defun


Defines a function 



    (lambda arguments
        expression
        ...
    )
  • lambda defines an anonymous function


    •     (defun name arguments
        expression
        ...
    )
  • defun assigns a lambda expression to its first argument




    • Examples

      (defun square (x) (* x x))

      (square 4)

    		 
      (setq square2
    (lambda (x) (* x x))
)

      (square2 4)

    		 
      (mapcar
    '(lambda (x) (* 2 x))
    '(1 2 3 4)
)
    		 
      (defun average (alist)
    (/ (apply '+ alist)
       (length alist))
)

      (average '(2 4 6 8))

    		 
      (defun dotproduct (v1 v2)
    (apply '+ (mapcar '* v1 v2))
)

      (dotproduct '(1 2 3) '(2 3 4))

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