or
(defn enumerate [xs] (map vector (range) xs))
(defn altsum [n] (reduce (fn [acc [i f]] (f acc (inc i)))
0
(take n (enumerate (cycle [+ -])))))
On Fri, Nov 14, 2014 at 3:41 PM, Andrew Oberstar <ajobers...@gmail.com>
wrote:
> How about this?
>
> (defn cyclefn
> [& fs]
> (let [fcycle (cycle fs)
> rem-fs (atom fcycle)]
> (fn [& args]
> (let [f (first @rem-fs)]
> (swap! rem-fs rest)
> (apply f args)))))
>
> (reduce (cyclefn + -) (range 1 100))
>
> cyclefn could be used to cycle through any set of functions you want and
> the result used as if it was a normal function.
>
>
> Andy
>
> On Fri, Nov 14, 2014 at 7:16 AM, Henrik Lundahl <henrik.lund...@gmail.com>
> wrote:
>
>> How about this? :-)
>>
>> (defn altsum [n] (/ (if (odd? n) (+ 1 n) (- n)) 2))
>>
>> --
>> Henrik
>>
>>
>> On Fri, Nov 14, 2014 at 1:48 PM, Gary Verhaegen <gary.verhae...@gmail.com
>> > wrote:
>>
>>> What about cheating a bit?
>>>
>>> (interleave
>>> (iterate #(+ % 2) 1)
>>> (iterate #(- % 2) -2))
>>>
>>> Then take n, reduce +, or whatever else you might want to do with the
>>> series.
>>>
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>>
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>
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--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]
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