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targets.html
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targets.html
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<title>Add representation targets — targets • prioritizr</title>
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<h1>Add representation targets</h1>
<small class="dont-index">Source: <a href='https://github.com/prioritizr/prioritizr/blob/master/R/targets.R'><code>R/targets.R</code></a></small>
<div class="hidden name"><code>targets.Rd</code></div>
</div>
<div class="ref-description">
<p>Targets are used to specify the minimum amount or proportion of a feature's
distribution that should (ideally) be covered (represented) by a solution.</p>
</div>
<h2 class="hasAnchor" id="details"><a class="anchor" href="#details"></a>Details</h2>
<p><strong>Please note that most objectives require targets, and attempting
to solve a problem that requires targets will throw an error.</strong></p>
<p>The following functions can be used to specify targets for a
conservation planning <code><a href='problem.html'>problem()</a></code>:</p>
<dl>
<dt><code><a href='add_relative_targets.html'>add_relative_targets()</a></code></dt><dd><p>Set targets as a proportion
(between 0 and 1) of the total amount of each feature in the
the study area.</p></dd>
<dt><code><a href='add_absolute_targets.html'>add_absolute_targets()</a></code></dt><dd><p>Set targets that denote the
minimum amount of each feature required in the prioritization.</p></dd>
<dt><code><a href='add_loglinear_targets.html'>add_loglinear_targets()</a></code></dt><dd><p>Set targets as a proportion
(between 0 and 1) that are calculated using log-linear interpolation.</p></dd>
<dt><code><a href='add_manual_targets.html'>add_manual_targets()</a></code></dt><dd><p>Set targets manually.</p></dd>
</dl>
<h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
<div class='dont-index'><p>Other overviews:
<code><a href='constraints.html'>constraints</a></code>,
<code><a href='decisions.html'>decisions</a></code>,
<code><a href='importance.html'>importance</a></code>,
<code><a href='objectives.html'>objectives</a></code>,
<code><a href='penalties.html'>penalties</a></code>,
<code><a href='portfolios.html'>portfolios</a></code>,
<code><a href='solvers.html'>solvers</a></code>,
<code><a href='summaries.html'>summaries</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'># 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 base 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_binary_decisions.html'>add_binary_decisions</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_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 class='r-in'></span>
<span class='r-in'><span class='co'># create problem with added relative targets</span></span>
<span class='r-in'><span class='va'>p1</span> <span class='op'><-</span> <span class='va'>p</span> <span class='op'><a href='pipe.html'>%>%</a></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>
<span class='r-in'></span>
<span class='r-in'><span class='co'># create problem with added absolute targets</span></span>
<span class='r-in'><span class='va'>p2</span> <span class='op'><-</span> <span class='va'>p</span> <span class='op'><a href='pipe.html'>%>%</a></span> <span class='fu'><a href='add_absolute_targets.html'>add_absolute_targets</a></span><span class='op'>(</span><span class='fl'>3</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># create problem with added loglinear targets</span></span>
<span class='r-in'><span class='va'>p3</span> <span class='op'><-</span> <span class='va'>p</span> <span class='op'><a href='pipe.html'>%>%</a></span> <span class='fu'><a href='add_loglinear_targets.html'>add_loglinear_targets</a></span><span class='op'>(</span><span class='fl'>10</span>, <span class='fl'>0.9</span>, <span class='fl'>100</span>, <span class='fl'>0.2</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># create problem with manual targets that equate to 10% relative targets</span></span>
<span class='r-in'><span class='va'>p4</span> <span class='op'><-</span> <span class='va'>p</span> <span class='op'><a href='pipe.html'>%>%</a></span> <span class='fu'><a href='add_manual_targets.html'>add_manual_targets</a></span><span class='op'>(</span><span class='fu'><a href='https://rdrr.io/r/base/data.frame.html'>data.frame</a></span><span class='op'>(</span>feature <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/pkg/raster/man/names.html'>names</a></span><span class='op'>(</span><span class='va'>sim_features</span><span class='op'>)</span>,</span>
<span class='r-in'> target <span class='op'>=</span> <span class='fl'>0.1</span>,</span>
<span class='r-in'> type <span class='op'>=</span> <span class='st'>"relative"</span><span class='op'>)</span><span class='op'>)</span></span>
<span class='r-in'><span class='co'># \dontrun{</span></span>
<span class='r-in'><span class='co'># solve problem</span></span>
<span class='r-in'><span class='va'>s</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='solve.html'>solve</a></span><span class='op'>(</span><span class='va'>p1</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 class='fu'><a href='solve.html'>solve</a></span><span class='op'>(</span><span class='va'>p3</span><span class='op'>)</span>, <span class='fu'><a href='solve.html'>solve</a></span><span class='op'>(</span><span class='va'>p4</span><span class='op'>)</span><span class='op'>)</span></span>
<span class='r-in'></span>
<span class='r-in'><span class='co'># plot solution</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='va'>s</span>, axes <span class='op'>=</span> <span class='cn'>FALSE</span>, box <span class='op'>=</span> <span class='cn'>FALSE</span>,</span>
<span class='r-in'> main <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='st'>"relative targets"</span>, <span class='st'>"absolute targets"</span>, <span class='st'>"loglinear targets"</span>,</span>
<span class='r-in'> <span class='st'>"manual targets"</span><span class='op'>)</span><span class='op'>)</span></span>
<span class='r-plt'><img src='targets-1.png' alt='' width='700' height='433' /></span>
<span class='r-in'><span class='co'># }</span></span>
</code></pre></div>
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