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 <javascript:>
> > 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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