public static Quaternion exp(Quaternion q) {
final double k = Math.exp(q.re);
Double3Vector imag = q.imag();
final double imagNorm = imag.norm();
return new Quaternion(
k * Math.cos(imagNorm),
(Double3Vector) imag.normalize().scalarMultiply(k * Math.sin(imagNorm)));
}
/** Returns a hashcode for this quaternion. */
public int hashCode() {
return (int) (Math.exp(norm()));
}