bject containing the solution also contains additional columns, then
these columns will need to be subsetted prior to using this function
(see below for example with <code><a href="https://r-spatial.github.io/sf/reference/sf.html" class="external-link">sf::sf()</a></code> data).
Additionally, any planning units missing cost
(<code>NA</code>) values for a particular zone should also have missing (<code>NA</code>)
values in the argument to <code>solution</code>.</p></dd>


<dt><code>x</code> has <code><a href