If a speed boost is what you're going for, you can probably get one
from type coercion and (if you're not worried about overflow)
unchecked-math. As an example:
(defn step [x0, y0, xn, yn]
(let [dx0 (double x0)
dy0 (double y0)
dxn (double xn)
dyn (double yn)
xm (unchecked-add (unchecked-subtract (unchecked-multiply xn
xn)(unchecked-multiply yn yn)) x0)
ym (unchecked-add (unchecked-multiply 2 xn yn) y0)]
[xm ym]))
It's not pretty, I know, but you could assign shorter names for the
unchecked-math functions if you end up using them heavily.
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