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compile.html
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compile.html
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<h1>Compile a problem</h1>
<small class="dont-index">Source: <a href='https://github.com/prioritizr/prioritizr/blob/master/R/compile.R'><code>R/compile.R</code></a></small>
<div class="hidden name"><code>compile.Rd</code></div>
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<div class="ref-description">
<p>Compile a conservation planning <code><a href='problem.html'>problem()</a></code> into an
(potentially mixed) integer linear programming problem.</p>
</div>
<div class="ref-usage sourceCode"><pre class='sourceCode r'><code><span class='fu'>compile</span><span class='op'>(</span><span class='va'>x</span>, <span class='va'>...</span><span class='op'>)</span>
<span class='co'># S3 method for ConservationProblem</span>
<span class='fu'>compile</span><span class='op'>(</span><span class='va'>x</span>, compressed_formulation <span class='op'>=</span> <span class='cn'>NA</span>, <span class='va'>...</span><span class='op'>)</span></code></pre></div>
<h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
<table class="ref-arguments">
<colgroup><col class="name" /><col class="desc" /></colgroup>
<tr>
<th>x</th>
<td><p><code><a href='problem.html'>problem()</a></code> (i.e. <code><a href='ConservationProblem-class.html'>ConservationProblem</a></code>) object.</p></td>
</tr>
<tr>
<th>...</th>
<td><p>not used.</p></td>
</tr>
<tr>
<th>compressed_formulation</th>
<td><p><code>logical</code> should the conservation problem
compiled into a compressed version of a planning problem?
If <code>TRUE</code> then the problem is expressed using the compressed
formulation. If <code>FALSE</code> then the problem is expressed using the
expanded formulation. If <code>NA</code>, then the compressed is used unless one
of the constraints requires the expanded formulation. This argument
defaults to <code>NA</code>.</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p><code><a href='OptimizationProblem-class.html'>OptimizationProblem</a></code> object.</p>
<h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>
<p>This function might be useful for those interested in understanding
how their conservation planning <code><a href='problem.html'>problem()</a></code> is expressed
as a mathematical problem. However, if the problem just needs to
be solved, then the <code><a href='solve.html'>solve()</a></code> function should just be used.</p>
<p><strong>Please note that in nearly all cases, the default argument to
<code>formulation</code> should be used</strong>. The only situation where manually
setting the argument to <code>formulation</code> is desirable is during testing.
Manually setting the argument to <code>formulation</code> will at best
have no effect on the problem. At worst, it may result in
an error, a misspecified problem, or unnecessarily long
solve times.</p>
<h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
<div class="ref-examples sourceCode"><pre class='sourceCode r'><code><span class='r-in'><span class='co'># build minimal conservation problem</span></span>
<span class='r-in'><span class='va'>p</span> <span class='op'><-</span> <span class='fu'><a href='problem.html'>problem</a></span><span class='op'>(</span><span class='va'>sim_pu_raster</span>, <span class='va'>sim_features</span><span class='op'>)</span> <span class='op'><a href='pipe.html'>%>%</a></span></span>
<span class='r-in'> <span class='fu'><a href='add_min_set_objective.html'>add_min_set_objective</a></span><span class='op'>(</span><span class='op'>)</span> <span class='op'><a href='pipe.html'>%>%</a></span></span>
<span class='r-in'> <span class='fu'><a href='add_relative_targets.html'>add_relative_targets</a></span><span class='op'>(</span><span class='fl'>0.1</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># compile the conservation problem into an optimization problem</span></span>
<span class='r-in'><span class='va'>o</span> <span class='op'><-</span> <span class='fu'>compile</span><span class='op'>(</span><span class='va'>p</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># print the optimization problem</span></span>
<span class='r-in'><span class='fu'><a href='print.html'>print</a></span><span class='op'>(</span><span class='va'>o</span><span class='op'>)</span></span>
<span class='r-msg co'><span class='r-pr'>#></span> optimization problem</span>
<span class='r-msg co'><span class='r-pr'>#></span> model sense: min</span>
<span class='r-msg co'><span class='r-pr'>#></span> dimensions: 5, 90, 450 (nrow, ncol, ncell)</span>
<span class='r-msg co'><span class='r-pr'>#></span> variables: 90 (B)</span>
<span class='r-in'></span>
</code></pre></div>
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