e_sum</code> family of functions and ODE integrators, which cannot be overloaded.</p>
</section>
</section>
<section id="calling-functions" class="level2">
<h2 class="anchored" data-anchor-id="calling-functions">Calling functions</h2>
<p>All function arguments are mandatory—there are no default values.</p>
<section id="functions-as-expressions" class="level3 unnumbered">
<h3 class="unnumbered anchored" data-anchor-id="functions-as-expressions">Functions as expressions</h3>
<p>Functions with non-void retur