 distribution and elimination are not
and need to be added for the PK model to be valid.</p>
<p>A PK model can only have one component of each type and adding a
component with an already existing type will replace the previous
definition. For example, the distribution component will be a two
compartment model in the following snippet:</p>
<p></p><div class="sourceCode"><pre><code><a class="sourceLine" id="cb1-1" title="1">pkm &lt;-<span class="st"> </span><span class="kw">pk_model</span>() <span class="op">