ion established by <code>rombergabs</code> and <code>rombergtol</code>
is not satisfied, <code>romberg</code> prints an error message.
<code>romberg</code> always makes at least <code>rombergmin</code> iterations;
this is a heuristic intended to prevent spurious termination when the integrand is oscillatory.
</p>
<p><code>romberg</code> repeatedly evaluates the integrand after binding the variable
of integration to a specific value (and not before).
This evaluation policy makes it possible to nest calls to 