I am currently learning clojure by reading The Joy of Clojure and I
have 2 questions on float opertions:
- why does (+ 4.2 8.4) return 12.600000000000001 and (+ 1.5 2.6) 4.1?
Since 4.2, 8.4 and (+ 4.2 8.4) are java Doubles why does it not behave
as expected? What does clojure do in the background?
- I also have a question regarding float precison in big operations,
consider the following code:
(defn ope [a b] (+ a (* b (Math/sqrt b))))
(reduce ope (range 1000000))
3.999995000001039E14
vs
(loop [i 1 x 0]
(if (> i 1000000)
x
(recur (inc i) (ope x i))))
4.000005000001039E14 (which is what we get if we do a for loop in
java)
I had the same problem in haskell, why are the two results different?
Thanks in advance!
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