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add_top_portfolio.html
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add_top_portfolio.html
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<h1>Add a top portfolio</h1>
<small class="dont-index">Source: <a href='https://github.com/prioritizr/prioritizr/blob/master/R/add_top_portfolio.R'><code>R/add_top_portfolio.R</code></a></small>
<div class="hidden name"><code>add_top_portfolio.Rd</code></div>
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<div class="ref-description">
<p>Generate a portfolio of solutions for a conservation planning
<code><a href='problem.html'>problem()</a></code> by finding a pre-specified number of solutions that
are closest to optimality (i.e the top solutions).</p>
</div>
<div class="ref-usage sourceCode"><pre class='sourceCode r'><code><span class='fu'>add_top_portfolio</span><span class='op'>(</span><span class='va'>x</span>, <span class='va'>number_solutions</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>number_solutions</th>
<td><p><code>integer</code> number of solutions required.</p></td>
</tr>
</table>
<h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
<p>Object (i.e. <code><a href='ConservationProblem-class.html'>ConservationProblem</a></code>) with the portfolio
added to it.</p>
<h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>
<p>This strategy for generating a portfolio requires problems to
be solved using the <em>Gurobi</em> software suite (i.e. using
<code><a href='add_gurobi_solver.html'>add_gurobi_solver()</a></code>. Specifically, version 9.0.0 (or greater)
of the <span class="pkg">gurobi</span> package must be installed.
Note that the number of solutions returned may be less than the argument to
<code>number_solutions</code>, if the total number of feasible solutions
is less than the number of solutions requested.</p>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
<div class='dont-index'><p>See <a href='portfolios.html'>portfolios</a> for an overview of all functions for adding a portfolio.</p>
<p>Other portfolios:
<code><a href='add_cuts_portfolio.html'>add_cuts_portfolio</a>()</code>,
<code><a href='add_extra_portfolio.html'>add_extra_portfolio</a>()</code>,
<code><a href='add_gap_portfolio.html'>add_gap_portfolio</a>()</code>,
<code><a href='add_shuffle_portfolio.html'>add_shuffle_portfolio</a>()</code></p></div>
<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'># \dontrun{</span></span>
<span class='r-in'><span class='co'># set seed for reproducibility</span></span>
<span class='r-in'><span class='fu'><a href='https://rdrr.io/r/base/Random.html'>set.seed</a></span><span class='op'>(</span><span class='fl'>600</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># load data</span></span>
<span class='r-in'><span class='fu'><a href='https://rdrr.io/r/utils/data.html'>data</a></span><span class='op'>(</span><span class='va'>sim_pu_raster</span>, <span class='va'>sim_features</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># create minimal problem with a portfolio for the top 5 solutions</span></span>
<span class='r-in'><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 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'>0.05</span><span class='op'>)</span> <span class='op'><a href='pipe.html'>%>%</a></span></span>
<span class='r-in'> <span class='fu'>add_top_portfolio</span><span class='op'>(</span>number_solutions <span class='op'>=</span> <span class='fl'>5</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_default_solver.html'>add_default_solver</a></span><span class='op'>(</span>gap <span class='op'>=</span> <span class='fl'>0</span>, verbose <span class='op'>=</span> <span class='cn'>FALSE</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># solve problem and generate portfolio</span></span>
<span class='r-in'><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 class='r-in'></span>
<span class='r-in'><span class='co'># print number of solutions found</span></span>
<span class='r-in'><span class='fu'><a href='print.html'>print</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/base/length.html'>length</a></span><span class='op'>(</span><span class='va'>s1</span><span class='op'>)</span><span class='op'>)</span></span>
<span class='r-out co'><span class='r-pr'>#></span> [1] 5</span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># plot solutions</span></span>
<span class='r-in'><span class='fu'><a href='https://rdrr.io/pkg/raster/man/plot.html'>plot</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/pkg/raster/man/stack.html'>stack</a></span><span class='op'>(</span><span class='va'>s1</span><span class='op'>)</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 class='r-plt'><img src='add_top_portfolio-1.png' alt='' width='700' height='433' /></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># create multi-zone problem with a portfolio for the top 5 solutions</span></span>
<span class='r-in'><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 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='fu'><a href='https://rdrr.io/r/base/matrix.html'>matrix</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/stats/Uniform.html'>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 class='r-in'> 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 class='r-in'> <span class='fu'>add_top_portfolio</span><span class='op'>(</span>number_solutions <span class='op'>=</span> <span class='fl'>5</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_default_solver.html'>add_default_solver</a></span><span class='op'>(</span>gap <span class='op'>=</span> <span class='fl'>0</span>, verbose <span class='op'>=</span> <span class='cn'>FALSE</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># solve problem and generate portfolio</span></span>
<span class='r-in'><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 class='r-in'></span>
<span class='r-in'><span class='co'># print number of solutions found</span></span>
<span class='r-in'><span class='fu'><a href='print.html'>print</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/base/length.html'>length</a></span><span class='op'>(</span><span class='va'>s2</span><span class='op'>)</span><span class='op'>)</span></span>
<span class='r-out co'><span class='r-pr'>#></span> [1] 5</span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># plot solutions in portfolio</span></span>
<span class='r-in'><span class='fu'><a href='https://rdrr.io/pkg/raster/man/plot.html'>plot</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/pkg/raster/man/stack.html'>stack</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/base/lapply.html'>lapply</a></span><span class='op'>(</span><span class='va'>s2</span>, <span class='va'>category_layer</span><span class='op'>)</span><span class='op'>)</span>, main <span class='op'>=</span> <span class='st'>"solution"</span>, axes <span class='op'>=</span> <span class='cn'>FALSE</span>,</span>
<span class='r-in'> box <span class='op'>=</span> <span class='cn'>FALSE</span><span class='op'>)</span></span>
<span class='r-plt'><img src='add_top_portfolio-2.png' alt='' width='700' height='433' /></span>
<span class='r-in'><span class='co'># }</span></span>
</code></pre></div>
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