On Friday, October 17, 2014 1:21:55 PM UTC+2, Jony Hudson wrote:
>
> Thanks all again for the advice. For the record, I ended up writing the
> loop in Java - being constrained on the type of the data (it ultimately
> comes from Java code), and not wanting to pay the (newly reduced!) price of
>
Thanks all again for the advice. For the record, I ended up writing the
loop in Java - being constrained on the type of the data (it ultimately
comes from Java code), and not wanting to pay the (newly reduced!) price of
converting to vectorz for just this operation, this seemed like the best
wa
On Thursday, 16 October 2014 18:04:39 UTC+8, Jony Hudson wrote:
>
> Thanks @Mikera. I had a look at using core.matrix, but what I couldn't
> figure out is how to quickly get the data into core.matrix form. For
> instance, if I take my PersistentList of Doubles from the example then
> getting it
Thanks @Mikera. I had a look at using core.matrix, but what I couldn't
figure out is how to quickly get the data into core.matrix form. For
instance, if I take my PersistentList of Doubles from the example then
getting it into a vectors array takes:
(criterium/quick-bench (array :vectorz a))
E
This is a case where I would definitely recommend using core.matrix /
vectorz-clj
(let [a (array :vectorz (range 1000))
b (array :vectorz (range 1000 2000))]
(criterium/quick-bench (esum (sub a b
=> Execution time mean : 2.266914 µs
Or it's even faster if you notice that you c
There are primitive vectors. Extraordinary clever.
http://clojuredocs.org/clojure.core/vector-of
/Linus
Den 16 okt 2014 00:02 skrev "Jony Hudson" :
> Thanks, that's really useful!
>
>
> Jony
>
>
> On Wednesday, 15 October 2014 20:53:40 UTC+1, Jony Hudson wrote:
>>
>> Hi all,
>>
>> another perfo
Thanks, that's really useful!
Jony
On Wednesday, 15 October 2014 20:53:40 UTC+1, Jony Hudson wrote:
>
> Hi all,
>
> another performance question ... this time about arithmetic on vectors
> :-) Let's say I have two vectors of numbers (specifically, things with type
> clojure.lang.PersistentVe
Slowdowns wrt math are caused mainly by boxing and range check, see this
thread [1]
[1] https://groups.google.com/d/msg/clojure/kcx5eKdMxcs/Wy4_IHrSEaMJ
Jozef
On Wednesday, October 15, 2014 9:53:40 PM UTC+2, Jony Hudson wrote:
>
> Hi all,
>
> another performance question ... this time about ar
Hi all,
another performance question ... this time about arithmetic on vectors :-)
Let's say I have two vectors of numbers (specifically, things with type
clojure.lang.PersistentVector, containing things of type java.lang.Double).
And let's say I want to sum the differences [1] between corresp
