People frequently make their own modified versions of Clojure without
having their changes made part of the core Clojure distribution. That is
why I said "depending upon your goals". If your goal is to try it out and
learn from it, and you don't care whether it becomes part of the standard
Clojure distribution, then it does not matter what the Clojure core team's
priorities are, because they are not involved.
Andy
On Mon, Apr 27, 2015 at 10:46 AM, endbegin <nkripl...@gmail.com> wrote:
> As far as I know, Java Math does not have a complex number type. Some
> implementations of a complex number exist (such as Apache Commons Math),
> but they create a Complex class that implements Serializeable and a Commons
> specific interface.
>
> Modifying clojure.core itself is a bit daunting, and like you said, it
> would need to be a priority for the core team.
>
>
>
> On Monday, April 27, 2015 at 12:45:46 PM UTC-4, Andy Fingerhut wrote:
>>
>> Unless the Java Math library handles complex types already, I don't know
>> of any way to extend it in a way that would let you get the answer you want
>> from (Math/abs my-complex-number) in Clojure.
>>
>> If you want code that gives the correct answers, a library using vectors
>> or maps for complex numbers can get you there. Memory footprint and
>> performance should be better with Clojure records or a new class written
>> directly in Java. With a library, I don't know of any way to be able to
>> mix Clojure's arithmetic operations like + - * / etc. with its existing
>> numeric types, and your new library-implemented complex types.
>>
>> Support of Clojure's arithmetic operations on complex numbers might only
>> be achievable by modifying Clojure itself. Depending upon your goals, the
>> down side of that approach is that it will not become part of the normal
>> Clojure distribution unless the Clojure core team wants that addition,
>> which I would guess would be very low on their priority list (just a guess
>> -- I have no inside knowledge there).
>>
>> Andy
>>
>> On Mon, Apr 27, 2015 at 8:39 AM, endbegin <nkri...@gmail.com> wrote:
>>
>>> I have been thinking along the lines of mikera and Maik - and it seems
>>> like there is no further progress here? I would like to take a crack at
>>> creating a complex number type, but implemented as a library to Clojure. I
>>> am not sure where to start, and if anyone here has suggestions, I'd be
>>> happy to hear them.
>>>
>>> A complex number could simply be a vector of two elements, or a map with
>>> :real and :imag keys (or something lightweight) - and I am not sure what it
>>> would require to make this type work happily with code arithmetic functions
>>> in Clojure and Java Math.
>>>
>>> It would also have to work with seq operations in Clojure - for
>>> instance:
>>> If I have a complex number c = {:real 3 :imag 4}, and a vector v = [1 -2
>>> c], it would be nice to have the call 'map #(Math/abs %) v' produce (1 2
>>> 5).
>>>
>>> I am having trouble figuring out all the pieces that need to be
>>> implemented. Is it even possible to implement this as a library, or does
>>> this need to be a part of clojure.core?
>>>
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