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Old   September 29, 2011, 04:18
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zhjieli
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I have write scheme programe as this:
(define line1 (list 1 2 3 4 5 6 7 8 9))
(define l '())
(do ((i 0 (+ i 3))) ((> i (length line1)))
(set! l (append l (list (list-ref line1 i)) ))
)
when I read it in fluent ,occur this error
Error: CAR: invalid argument [1]: wrong type [not a pair]
Error Object: ()
but I defined that this programe' function was completed.

Please, someone can help me?
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Old   September 29, 2011, 12:00
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List index start at 0.

The max valid index is

Code:
 (- (length l) 1)
In your code, the error occurs when the index is 9, which exceed the max index value.
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Old   September 30, 2011, 01:15
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thank!
You are warm-hearted man
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