er">lanczos</span><span class="special">(</span><span class="identifier">v2</span><span class="special">);</span> <span class="comment">// threadsafe</span>
<span class="comment">// need to use a different spacing?</span>
<span class="identifier">lanczos</span><span class="special">.</span><span class="identifier">reset_spacing</span><span class="special">(</span><span class="number">0.02</span><span class="special">);</span> <span class="comment">// not threadsafe</span>
</pre>
<p>
      The implementation