I'm working on a java array of double with 1280000 elements. I need the max 
and min values of the array. So I initially tried areduce and loop, both 
gives runs around 20 seconds. But when try (apply max (vec array)) I get 
result under 90 ms.
Can anyone explain why there is such a big difference?
Also if want to iterate large java array like this to do some other 
operations, e.g. convolution, what's the best way to go? Is there another 
fast way to iterate through array or do I need to convert array into vector?

Thanks
Ritchie

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