Hi,
I tried experimenting with lazy sequences and wrote this program
(def nums (cons 2 (lazy-seq (map inc nums))))
(def primes (cons (first nums)
(lazy-seq (->>
(rest nums)
(remove
(fn [x]
(let [dividors (take-while #(<= (* % %) x)
primes)]
(some #(= 0 (rem x %)) dividors))))))))
It works fine. However if I redefine nums like this
(def nums (drop 2 (range)))
It gives me a wrong result
e.g. (take 5 primes) is (2 3 5 7 9)
I don't see how that can be.
I put in a println to see where the problem is
I inserted this line before the "some" function call.
(println (str "x = " x ", dividors = " (seq dividors)))
If I then define nums as (drop 2 (range))
and write (take 5 primes) I get this output
(x = 3, dividors =
x = 4, dividors = (2)
x = 5, dividors = (2)
x = 6, dividors = (2)
x = 7, dividors = (2)
x = 8, dividors = (2)
x = 9, dividors = (2)
x = 10, dividors = (2)
x = 11, dividors = (2)
x = 12, dividors = (2)
x = 13, dividors = (2)
x = 14, dividors = (2)
x = 15, dividors = (2)
x = 16, dividors = (2)
x = 17, dividors = (2)
x = 18, dividors = (2)
x = 19, dividors = (2)
x = 20, dividors = (2)
x = 21, dividors = (2)
x = 22, dividors = (2)
x = 23, dividors = (2)
x = 24, dividors = (2)
x = 25, dividors = (2)
x = 26, dividors = (2)
x = 27, dividors = (2)
x = 28, dividors = (2)
x = 29, dividors = (2)
x = 30, dividors = (2)
x = 31, dividors = (2)
2 3 5 7 9)
That just doesn't make any sense. Can anyone explain this?
btw, I use clojure 1.2.0
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