n)
</p>
<h2>Syntax</h2><p><tt>Y = asinh(X)</tt></p>
<h2>Description</h2>
<p>
<tt>asin(X)</tt> computes the inverse hyperbolic sine of its argument,
which must be a real quaternion (<tt>asinh</tt> is not yet implemented for
complexified quaternions).
</p>
<p>
This function is computed using the Matlab&reg; function of the same name by
first computing an isomorphic complex number. The result is then assigned
the same quaternion axis as the original argument.
</p>

<h2>Examples</h2>
<pre>
&gt;&gt; asinh(qi + q