On Jun 29, 2011, at 1:45 AM, David Sletten wrote:
(defn compute-contrib [daily-values total-values]
(loop [contrib []
daily-values daily-values
total-values total-values]
(if (empty? daily-values)
contrib
(recur (conj contrib (* (first daily-values)
Hi,
just for fun another variation. The two reverse calls are ugly, but
necessary to get the order right for the reductions call.
(defn contribution
[daily-values total-values]
(let [weights (- (rest total-values)
(map #(/ % 100.0))
reverse
How about this one?
(defn calc [total-values daily-values]
(map-indexed
(fn [i daily]
(* daily
(reduce #(* %1 (inc (/ %2 100.0))) 1.0 (nthnext total-
values (inc i)
daily-values))
Happy coding.
-huahai
On Jun 28, 10:11 pm, Justin Kramer jkkra...@gmail.com
If you're already doing a bunch of multiplication in the reduce, you
don't need to do it outside as well, do you?
And because reduce doesn't care about laziness, you can use drop
instead of nthnext (which I think is clearer in almost all cases).
(defn calc [total-values daily-values]
On Wed, Jun 29, 2011 at 3:53 AM, Alan Malloy a...@malloys.org wrote:
This layout makes it fairly clear that the first element of total-
values is never being used, but it would be nice if we could say so
explicitly. So finally, we can wrap the whole thing in a let:
(defn calc [total-values
On Jun 29, 12:55 am, Ken Wesson kwess...@gmail.com wrote:
On Wed, Jun 29, 2011 at 3:53 AM, Alan Malloy a...@malloys.org wrote:
This layout makes it fairly clear that the first element of total-
values is never being used, but it would be nice if we could say so
explicitly. So finally, we
The multiplication outside the reduce is required because it is part
of the original logic: contrib[i] = sum * dailyValues[i];. Using the
drop function is a very good call though.
-huahai
On Jun 29, 12:53 am, Alan Malloy a...@malloys.org wrote:
If you're already doing a bunch of multiplication
.
-Original Message-
From: clojure@googlegroups.com [mailto:clojure@googlegroups.com] On Behalf Of
Alan Malloy
Sent: Wednesday, June 29, 2011 4:50 AM
To: Clojure
Subject: Re: Translating Java code with nested for loops
On Jun 29, 12:55 am, Ken Wesson kwess...@gmail.com wrote:
On Wed, Jun 29
(* daily (reduce * 1 coll))
;; is exactly equal to
(reduce * daily coll)
My point is you can start with daily instead of with 1, and thus not
have to special-case it in at the end.
On Jun 29, 8:22 am, Huahai Yang huahai.y...@gmail.com wrote:
The multiplication outside the reduce is required
Missed that one. Yeah, that's much nicer. -huahai
On Jun 29, 6:39 pm, Alan Malloy a...@malloys.org wrote:
(* daily (reduce * 1 coll))
;; is exactly equal to
(reduce * daily coll)
My point is you can start with daily instead of with 1, and thus not
have to special-case it in at the end.
On
-
From: clojure@googlegroups.com [mailto:clojure@googlegroups.com] On Behalf Of
Huahai Yang
Sent: Thursday, June 30, 2011 12:33 AM
To: Clojure
Subject: Re: Translating Java code with nested for loops
Missed that one. Yeah, that's much nicer. -huahai
On Jun 29, 6:39 pm, Alan Malloy a...@malloys.org
Hi
I have been learning clojure for some time but am a bit stumped when
translating code with nested for loops.
Can someone help me to translate the following java code to clojure
elegantly:
The inputs are two arrays of type double of the same length -
dailyValues and totalValues. The output
On Jun 28, 2011, at 8:20 PM, Bhinderwala, Shoeb wrote:
The inputs are two arrays of type double of the same length – dailyValues and
totalValues. The output is the array contrib of the same length.
int n = dailyValues.length;
for (int i = 0; i n; i++)
{
Here's one way.
(defn tails [coll]
(take-while seq (iterate rest coll)))
(defn calc [total-values daily-values]
(map * daily-values (for [tail (tails total-values)]
(reduce #(* %1 (inc (/ %2 100.0)))
1.0
On Jun 28, 2011, at 11:37 PM, David Sletten wrote:
On Jun 28, 2011, at 8:20 PM, Bhinderwala, Shoeb wrote:
The inputs are two arrays of type double of the same length – dailyValues
and totalValues. The output is the array contrib of the same length.
int n = dailyValues.length;
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