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add_proportion_decisions.html
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add_proportion_decisions.html
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<!DOCTYPE html>
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This is a relaxed decision where a part of a planning unit can be
prioritized as opposed to the entire planning unit. Typically, this decision
has the assumed action of buying a fraction of a planning unit to include in
decisions will solve much faster than problems that use binary-type
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<h1>Add proportion decisions</h1>
<small class="dont-index">Source: <a href="https://github.com/prioritizr/prioritizr/blob/HEAD/R/add_proportion_decisions.R" class="external-link"><code>R/add_proportion_decisions.R</code></a></small>
<div class="hidden name"><code>add_proportion_decisions.Rd</code></div>
</div>
<div class="ref-description">
<p>Add a proportion decision to a conservation planning <code><a href="problem.html">problem()</a></code>.
This is a relaxed decision where a part of a planning unit can be
prioritized as opposed to the entire planning unit. Typically, this decision
has the assumed action of buying a fraction of a planning unit to include in
decisions will solve much faster than problems that use binary-type
decisions</p>
</div>
<div id="ref-usage">
<div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">add_proportion_decisions</span><span class="op">(</span><span class="va">x</span><span class="op">)</span></span></code></pre></div>
</div>
<div id="arguments">
<h2>Arguments</h2>
<dl><dt>x</dt>
<dd><p><code><a href="problem.html">problem()</a></code> (i.e., <code><a href="ConservationProblem-class.html">ConservationProblem</a></code>) object.</p></dd>
</dl></div>
<div id="value">
<h2>Value</h2>
<p>Object (i.e., <code><a href="ConservationProblem-class.html">ConservationProblem</a></code>) with the decisions added
to it.</p>
</div>
<div id="details">
<h2>Details</h2>
<p>Conservation planning problems involve making decisions on planning
units. These decisions are then associated with actions (e.g., turning a
planning unit into a protected area). Only a
single decision should be added to a <code>ConservationProblem</code> object.
Note that if multiple decisions are added to a problem object, then the
last one to be added will be used.</p>
</div>
<div id="see-also">
<h2>See also</h2>
<div class="dont-index"><p>See <a href="decisions.html">decisions</a> for an overview of all functions for adding decisions.</p>
<p>Other decisions:
<code><a href="add_binary_decisions.html">add_binary_decisions</a>()</code>,
<code><a href="add_default_decisions.html">add_default_decisions</a>()</code>,
<code><a href="add_semicontinuous_decisions.html">add_semicontinuous_decisions</a>()</code></p></div>
</div>
<div id="ref-examples">
<h2>Examples</h2>
<div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># \dontrun{</span></span></span>
<span class="r-in"><span><span class="co"># set seed for reproducibility</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/Random.html" class="external-link">set.seed</a></span><span class="op">(</span><span class="fl">500</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># load data</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/utils/data.html" class="external-link">data</a></span><span class="op">(</span><span class="va">sim_pu_raster</span>, <span class="va">sim_features</span>, <span class="va">sim_pu_zones_stack</span>, <span class="va">sim_features_zones</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># create minimal problem with proportion decisions</span></span></span>
<span class="r-in"><span><span class="va">p1</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>
<span class="r-in"><span> <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>
<span class="r-in"><span> <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 class="op"><a href="pipe.html">%>%</a></span></span></span>
<span class="r-in"><span> <span class="fu">add_proportion_decisions</span><span class="op">(</span><span class="op">)</span> <span class="op"><a href="pipe.html">%>%</a></span></span></span>
<span class="r-in"><span> <span class="fu"><a href="add_default_solver.html">add_default_solver</a></span><span class="op">(</span>verbose <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># solve problem</span></span></span>
<span class="r-in"><span><span class="va">s1</span> <span class="op"><-</span> <span class="fu"><a href="solve.html">solve</a></span><span class="op">(</span><span class="va">p1</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># plot solutions</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/plot.html" class="external-link">plot</a></span><span class="op">(</span><span class="va">s1</span>, main <span class="op">=</span> <span class="st">"solution"</span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="add_proportion_decisions-1.png" alt="" width="700" height="433"></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># build multi-zone conservation problem with proportion decisions</span></span></span>
<span class="r-in"><span><span class="va">p2</span> <span class="op"><-</span> <span class="fu"><a href="problem.html">problem</a></span><span class="op">(</span><span class="va">sim_pu_zones_stack</span>, <span class="va">sim_features_zones</span><span class="op">)</span> <span class="op"><a href="pipe.html">%>%</a></span></span></span>
<span class="r-in"><span> <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>
<span class="r-in"><span> <span class="fu"><a href="add_relative_targets.html">add_relative_targets</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/base/matrix.html" class="external-link">matrix</a></span><span class="op">(</span><span class="fu"><a href="https://rdrr.io/r/stats/Uniform.html" class="external-link">runif</a></span><span class="op">(</span><span class="fl">15</span>, <span class="fl">0.1</span>, <span class="fl">0.2</span><span class="op">)</span>, nrow <span class="op">=</span> <span class="fl">5</span>,</span></span>
<span class="r-in"><span> ncol <span class="op">=</span> <span class="fl">3</span><span class="op">)</span><span class="op">)</span> <span class="op"><a href="pipe.html">%>%</a></span></span></span>
<span class="r-in"><span> <span class="fu">add_proportion_decisions</span><span class="op">(</span><span class="op">)</span> <span class="op"><a href="pipe.html">%>%</a></span></span></span>
<span class="r-in"><span> <span class="fu"><a href="add_default_solver.html">add_default_solver</a></span><span class="op">(</span>verbose <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># solve the problem</span></span></span>
<span class="r-in"><span><span class="va">s2</span> <span class="op"><-</span> <span class="fu"><a href="solve.html">solve</a></span><span class="op">(</span><span class="va">p2</span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># print solution</span></span></span>
<span class="r-in"><span><span class="fu"><a href="print.html">print</a></span><span class="op">(</span><span class="va">s2</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#></span> class : RasterStack </span>
<span class="r-out co"><span class="r-pr">#></span> dimensions : 10, 10, 100, 3 (nrow, ncol, ncell, nlayers)</span>
<span class="r-out co"><span class="r-pr">#></span> resolution : 0.1, 0.1 (x, y)</span>
<span class="r-out co"><span class="r-pr">#></span> extent : 0, 1, 0, 1 (xmin, xmax, ymin, ymax)</span>
<span class="r-out co"><span class="r-pr">#></span> crs : NA </span>
<span class="r-out co"><span class="r-pr">#></span> names : zone_1, zone_2, zone_3 </span>
<span class="r-out co"><span class="r-pr">#></span> min values : 0, 0, 0 </span>
<span class="r-out co"><span class="r-pr">#></span> max values : 1, 1, 1 </span>
<span class="r-out co"><span class="r-pr">#></span> </span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># plot solution</span></span></span>
<span class="r-in"><span><span class="co"># panels show the proportion of each planning unit allocated to each zone</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/plot.html" class="external-link">plot</a></span><span class="op">(</span><span class="va">s2</span>, axes <span class="op">=</span> <span class="cn">FALSE</span>, box <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="add_proportion_decisions-2.png" alt="" width="700" height="433"></span>
<span class="r-in"><span><span class="co"># }</span></span></span>
</code></pre></div>
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