Hello all,
Just started learning clojure recently - initial examples were easy to
understand, until I found this example
fibonacci sequence using lazy-cat :
(def fibs (lazy-cat [0 1] (map + fibs (rest fibs
I am trying to understand how this works ..not sure i fully comprehend
it.
Can
Hi swaroop,
2009/7/29 swaroop belur swaroop.be...@gmail.com:
fibonacci sequence using lazy-cat :
(def fibs (lazy-cat [0 1] (map + fibs (rest fibs
I am trying to understand how this works ..not sure i fully comprehend
it.
Can anyone please explain how clojure evaluates this.
I'll
Swaroop,
Just started learning clojure recently - initial examples were easy to
understand, until I found this example
fibonacci sequence using lazy-cat :
(def fibs (lazy-cat [0 1] (map + fibs (rest fibs
I am trying to understand how this works ..not sure i fully comprehend
cool - thanks guys for the detailed reply. crystal clear now -:)
Thx
swaroop
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Note that
While fibs is a nice small example, it is not idiomatic Clojure.
Pointing the fibs var to the head of the list keeps the whole list in
memory as it realizes. Better is to expose fibs as a *function* return
the sequence, so the head is not retained.
(defn fibo []
(map first (iterate (fn
Hi David,
(defn fib (fib-helper 0 1)) ; This doesn't work either: (defn fib (fib-
helper '(0 1)))
You're missing your argument list for fib.
I assumed you meant the empty square brackets [] just after the work
fib? I didn't realise these were necessary even when there were no
function
Craig,
Something you should be aware of is that this implementation of
Fibonacci is very inefficient. For more info as to why, you can read:
http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-11.html#%_sec_1.2.2
The short story is doing it this way performs a lot of wasted
calculations as n
Hi,
I'm trying to learn lisp and Clojure and so I'm trying some excercises
suggested here on the group a while ago.
I'm not doing too well, I had to cheat on excercise one (make a series
of integers) by looking at the source code to the range function, and
I'm now having to ask for help with
(defn fib-helper [a b]
(fib-helper b (+ a b)))
(defn fib (fib-helper 0 1)) ; This doesn't work either: (defn fib (fib-
helper '(0 1)))
You're missing your argument list for fib.
(println (take 5 fib))
take creates a lazy list from a collection:
(take n collection)
Your fib does not
On Sun, Dec 28, 2008 at 6:01 PM, Craig Marshall cra...@gmail.com wrote:
Hi,
I'm trying to learn lisp and Clojure and so I'm trying some excercises
suggested here on the group a while ago.
I'm not doing too well, I had to cheat on excercise one (make a series
of integers) by looking at the
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