This is what I suspected. Of course, this is not just for abs, but really
for any mathematical operation. Sqrt, Trig operations etc.
I will study the Ratio type more closely, but note that something like
(Math/abs (/ 22 7)) does not work.
On Monday, April 27, 2015 at 12:45:32 PM UTC-4, Gary Verhaegen wrote:
>
> As far as I understand, your example with Math/abs would need to be part
> of Java.
>
> You cannot extend the arithmetic operators in Java, and you will not be
> able to extend static Java methods like Math/abs.
>
> What you may be able to do is make your custom type play nice with Clojure
> operators, like Clojure's rationals and bignums.
>
> I'd suggest looking at the code for these, and considering a Java class
> with two primitive attributes rather than a Clojure vector or map (which
> have a big overhead compared to a simple number). Depending on what you
> want to do, you may also want to consider implementing a "vector of
> complex" type, which could be a single object with two primitive arrays.
>
> If you're targeting a performant implementation, you should probably cross
> post to numerical-clojure; people over there have a lot of experience about
> numerical optimizations in Clojure.
>
> On Monday, 27 April 2015, 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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