Hi Herwig,
Thanks for the reply! I think I had tried that before and I tried again
just now but it gives a problem of arity:
CompilerException java.lang.RuntimeException: Can't have fixed arity
function with more params than variadic function,
compiling:(audio_seq/core.clj:42)
which makes sense. Using apply map though does simplify it a bit:
(defn amix
([] [])
([& a]
(let [len (count a)]
(if (= len 1)
(first a)
(apply map + a)))))
and that is working rather nicely, thanks!
I spent a couple hours today trying to work on performance of the code and
it's unfortunately very poor at the moment. Doing a lot of number
crunching with lazy sequences, while elegant, seems to be not very
performant. I think I need to learn a bit more about Clojure and perhaps
rethink my design strategy for this work.
Thanks again!
steven
On Saturday, February 16, 2013 1:35:14 AM UTC, Herwig Hochleitner wrote:
>
> Sorry, hit the wrong key early. This version handles the one arg case
> efficiently:
>
> (defn amix
> ([a] a)
> ([& as]
> (apply map + as)))
>
>
> 2013/2/16 Herwig Hochleitner <hhochl...@gmail.com <javascript:>>
>
>> To your first question: How about
>>
>> (defn amix
>> [& a]
>> (apply map + a))
>>
>>
>>
>> 2013/2/16 Steven Yi <stev...@gmail.com <javascript:>>
>>
>>> Hi All,
>>>
>>> I'm fairly new to Clojure (enjoying it very much!) and had a couple
>>> questions regarding lazy sequences.
>>>
>>> 1. With a sequence of sequences, I want to reduce the sequences down
>>> into a single sequence. So, the heads of all the sequences gets reduced,
>>> then the next items, etc. The end result would also be a lazy sequence.
>>> Right now I have this code that is working, but I wasn't sure if there's
>>> some other way that might be clearer:
>>>
>>> (defn amix
>>> ([] [])
>>> ([& a]
>>> (let [len (count a)]
>>> (if (= len 1)
>>> (first a)
>>> (map #(reduce + %) (partition len (apply interleave a)))))))
>>>
>>>
>>> 2. I'm planning to have a number of sequence transforming functions.
>>> Most will probably have this shape:
>>>
>>> (defn some-func [arg1 arg2 xs]
>>> (map #(some code...) xs))
>>>
>>> This would be so I could consume a lazy sequence xs, operate on it, then
>>> output a lazy sequence. I thought I might write a macro to simplify this
>>> and have the function do its own lazy-seq and recursive call to itself,
>>> rather than go through map (figured it might save some call overhead, and
>>> simplify the macro writing, but am still a bit new with this). I imagine
>>> this should work fine, but is this kind of thing already encapsulated
>>> somewhere?
>>>
>>> Thanks!
>>> steven
>>>
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>>
>>
>
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