failed to understand the error..

Hi.. as I told before, I am a beginner in LISP, trying to write something, but getting error.. "error: malformed list on input" . what it means?

I have list :- ((((1 . x ) (2 . y)) ((3 . z) (4 . a))) (((1 . m ) (2 . n)) ((3 . o) (4 . p)))))

I want this as :- (((x y) (z a)) ((m n) (o p)))

(defun test1 ()

(setq gb '((((1 . x ) (2 . y)) ((3 . z) (4 . a))) (((1 . m ) (2 . n)) ((3 . o) (4 . p)))))

(setq blanka '())

(setq blankb '())

(setq len1 (length gb))

(setq count1 0)

(while (

(setq data1 (nth count1 gb))

(setq len2 (length data1)

(setq count2 0)

(while (

(setq data2 (nth count2 data1))

(setq blankb (append blankb (list data2)))

(setq count2 (1+ count2))

) ; while

(setq blanka (append blanka (list data1)))

(setq count1 (1+ count2))

) ;while

)

It means your parenthesis don't match. You have to have the same number of open parenthesis as closed. That's why LISP stands for "Lost in Stupid Parenthesis."

Also, you're new, so you get a pass, but you need to wrap any and all code your post here in the code tags (the button that looks like a pound sign).

Then your code will look like this. 

Maybe this troubleshooter will help you in the future.

Also, as resullins states, enclose your code in code tags:

[noparse]

[/noparse][/color][color=darkgreen]Your code here[/color][color=red][noparse]

[/noparse]

sorry..I don't know the tagging process.. how I use code tag?

CODE POSTING GUIDELINES

@nila_joy: Don't pay attention to SLW210... he really hates people that miss his rules!

Now, you know for next time!

Hi.. as I told before, I am a beginner in LISP, trying to write something, but getting error.. "error: malformed list on input" . what it means?

I have list :- ((((1 . x ) (2 . y)) ((3 . z) (4 . a))) (((1 . m ) (2 . n)) ((3 . o) (4 . p)))))

I want this as :- (((x y) (z a)) ((m n) (o p)))

(defun test1 ()
 (setq gb '((((1 . x ) (2 . y)) ((3 . z) (4 . a))) (((1 . m ) (2 . n)) ((3 . o) (4 . p)))))

(setq blanka '())

(setq blankb '())

(setq len1 (length gb))

(setq count1 0)

(while (< count1 len1)

(setq data1 (nth count1 gb))

(setq len2 (length data1)

(setq count2 0)

(while (<count2 len2)

(setq data2 (nth count2 data1))

(setq blankb (append blankb (list data2)))

(setq count2 (1+ count2))

) ; while

(setq blanka (append blanka (list data1)))

(setq count1 (1+ count2))

) ;while

 )

got it man.. actually I was playing Company of heroes,but hanged when got ur msg .. ur words made it man

Consider this function:

(setq l '((((1 . x ) (2 . y)) ((3 . z) (4 . a))) (((1 . m ) (2 . n)) ((3 . o) (4 . p)))))

(mapcar
   (function
       (lambda ( a )
           (mapcar
               (function
                   (lambda ( b ) (mapcar 'cdr b))
               )
               a
           )
       )
   )
   l
)

Consider this function:

 

(setq l '((((1 . x ) (2 . y)) ((3 . z) (4 . a))) (((1 . m ) (2 . n)) ((3 . o) (4 . p)))))

(mapcar
   (function
       (lambda ( a )
           (mapcar
               (function
                   (lambda ( b ) (mapcar 'cdr b))
               )
               a
           )
       )
   )
   l
)

(defun foo (lst)
 (mapcar '(lambda (a) (mapcar '(lambda (b) (mapcar 'cdr b)) a)) lst)
)

Thnx resu.. "SLW-the Last hero" is under surveillance , but how should I rectify my error ?