Because bit-xor returns a integer,so you have to cast it to byte:

(amap ^bytes an-array
 idx
 ret
 (byte (bit-xor (byte 0)
            (aget ^bytes an-array idx))))

2012/2/17 Andreas Kostler <andreas.koestler.le...@gmail.com>

> Hi all,
> I'm experiencing the following problem:
>
> (def an-array (byte-array 200 (byte 1)))
> (amap ^bytes an-array
>  idx
>  ret
>  (bit-xor (byte 0)
>             (aget ^bytes an-array idx)))
>
> Resulting in:
>
> No matching method found: aset
>
> Wheras this:
>
> (def another-array (int-array 200 (int 1)))
> (amap ^ints an-array
>  idx
>  ret
>  (bit-xor (int 0)
>             (aget ^ints another-array idx)))
>
> Works as expected. Does anyone know what's going on?
> Clojure version is 1.3.0
>
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