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+<div class="subTitle">jcgp.backend.modules.problem</div>
+<h2 title="Class SymbolicRegressionProblem" class="title">Class SymbolicRegressionProblem</h2>
+</div>
+<div class="contentContainer">
+<ul class="inheritance">
+<li>java.lang.Object</li>
+<li>
+<ul class="inheritance">
+<li><a href="../../../../jcgp/backend/modules/Module.html" title="class in jcgp.backend.modules">jcgp.backend.modules.Module</a></li>
+<li>
+<ul class="inheritance">
+<li><a href="../../../../jcgp/backend/modules/problem/Problem.html" title="class in jcgp.backend.modules.problem">jcgp.backend.modules.problem.Problem</a></li>
+<li>
+<ul class="inheritance">
+<li><a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html" title="class in jcgp.backend.modules.problem">jcgp.backend.modules.problem.TestCaseProblem</a>&lt;java.lang.Double&gt;</li>
+<li>
+<ul class="inheritance">
+<li>jcgp.backend.modules.problem.SymbolicRegressionProblem</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+<div class="description">
+<ul class="blockList">
+<li class="blockList">
+<hr>
+<br>
+<pre>public class <span class="typeNameLabel">SymbolicRegressionProblem</span>
+extends <a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html" title="class in jcgp.backend.modules.problem">TestCaseProblem</a>&lt;java.lang.Double&gt;</pre>
+<div class="block">Symbolic regression functions
+ <br><br>
+ Using this problem type, regression problems can be solved.
+ <code>parseData()</code> must be used to load the desired function
+ data in the standard CGP .dat format.
+ <br><br>
+ This problem uses quite a few parameters:
+ <ul>
+ <li>Error threshold: the maximum difference allowed between an
+ evolved output and the equivalent output from the problem data.
+ Outputs within the error threshold will be considered correct.
+ This is only used if hits is enabled.</li>
+ <li>Perfection threshold: if the fitness is calculated without
+ using the hits method, it is a decimal value. A solution is
+ considered perfect when the difference between its fitness and
+ the maximum possible fitness is within the perfection threshold.</li>
+ <li>Hits-based fitness: increment the fitness by 1 whenever the
+ chromosome output is within the error threshold.</li></ul></div>
+<dl>
+<dt><span class="simpleTagLabel">Author:</span></dt>
+<dd>Eduardo Pedroni</dd>
+<dt><span class="seeLabel">See Also:</span></dt>
+<dd><a href="../../../../jcgp/backend/function/SymbolicRegressionFunctions.html" title="class in jcgp.backend.function"><code>SymbolicRegressionFunctions</code></a></dd>
+</dl>
+</li>
+</ul>
+</div>
+<div class="summary">
+<ul class="blockList">
+<li class="blockList">
+<!-- ======== NESTED CLASS SUMMARY ======== -->
+<ul class="blockList">
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+<h3>Nested Class Summary</h3>
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+<li class="blockList"><a name="nested.classes.inherited.from.class.jcgp.backend.modules.problem.TestCaseProblem">
+<!-- -->
+</a>
+<h3>Nested classes/interfaces inherited from class&nbsp;jcgp.backend.modules.problem.<a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html" title="class in jcgp.backend.modules.problem">TestCaseProblem</a></h3>
+<code><a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.TestCase.html" title="class in jcgp.backend.modules.problem">TestCaseProblem.TestCase</a>&lt;<a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.TestCase.html" title="type parameter in TestCaseProblem.TestCase">U</a>&gt;</code></li>
+</ul>
+</li>
+</ul>
+<!-- ======== CONSTRUCTOR SUMMARY ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor.summary">
+<!-- -->
+</a>
+<h3>Constructor Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
+<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
+<tr>
+<th class="colOne" scope="col">Constructor and Description</th>
+</tr>
+<tr class="altColor">
+<td class="colOne"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/SymbolicRegressionProblem.html#SymbolicRegressionProblem-jcgp.backend.resources.Resources-">SymbolicRegressionProblem</a></span>(<a href="../../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a>&nbsp;resources)</code>
+<div class="block">Creates a new instance of SymbolicRegressionProblem.</div>
+</td>
+</tr>
+</table>
+</li>
+</ul>
+<!-- ========== METHOD SUMMARY =========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.summary">
+<!-- -->
+</a>
+<h3>Method Summary</h3>
+<table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
+<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
+<tr>
+<th class="colFirst" scope="col">Modifier and Type</th>
+<th class="colLast" scope="col">Method and Description</th>
+</tr>
+<tr id="i0" class="altColor">
+<td class="colFirst"><code>void</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/SymbolicRegressionProblem.html#evaluate-jcgp.backend.population.Population-jcgp.backend.resources.Resources-">evaluate</a></span>(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population,
+ <a href="../../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a>&nbsp;resources)</code>
+<div class="block">The most important method of the problem type.</div>
+</td>
+</tr>
+<tr id="i1" class="rowColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/SymbolicRegressionProblem.html#hasImprovement-jcgp.backend.population.Population-">hasImprovement</a></span>(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</code>
+<div class="block">Used to assert whether a given population has a chromosome that is an improvement over
+ the current best chromosome.</div>
+</td>
+</tr>
+<tr id="i2" class="altColor">
+<td class="colFirst"><code><a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.TestCase.html" title="class in jcgp.backend.modules.problem">TestCaseProblem.TestCase</a>&lt;java.lang.Double&gt;</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/SymbolicRegressionProblem.html#parseTestCase-java.lang.String:A-java.lang.String:A-">parseTestCase</a></span>(java.lang.String[]&nbsp;inputs,
+ java.lang.String[]&nbsp;outputs)</code>
+<div class="block">This method is used internally by <code>addTestCase()</code> in order
+ to appropriately parse strings into the right data type for the
+ test cases.</div>
+</td>
+</tr>
+<tr id="i3" class="rowColor">
+<td class="colFirst"><code>int</code></td>
+<td class="colLast"><code><span class="memberNameLink"><a href="../../../../jcgp/backend/modules/problem/SymbolicRegressionProblem.html#perfectSolutionFound-jcgp.backend.population.Population-">perfectSolutionFound</a></span>(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</code>
+<div class="block">Used to assert whether a given population contains a perfect solution
+ to the problem.</div>
+</td>
+</tr>
+</table>
+<ul class="blockList">
+<li class="blockList"><a name="methods.inherited.from.class.jcgp.backend.modules.problem.TestCaseProblem">
+<!-- -->
+</a>
+<h3>Methods inherited from class&nbsp;jcgp.backend.modules.problem.<a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html" title="class in jcgp.backend.modules.problem">TestCaseProblem</a></h3>
+<code><a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html#addTestCase-java.lang.String:A-java.lang.String:A-">addTestCase</a>, <a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html#clearTestCases--">clearTestCases</a>, <a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html#getTestCases--">getTestCases</a>, <a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html#parseProblemData-java.io.File-jcgp.backend.resources.ModifiableResources-">parseProblemData</a></code></li>
+</ul>
+<ul class="blockList">
+<li class="blockList"><a name="methods.inherited.from.class.jcgp.backend.modules.problem.Problem">
+<!-- -->
+</a>
+<h3>Methods inherited from class&nbsp;jcgp.backend.modules.problem.<a href="../../../../jcgp/backend/modules/problem/Problem.html" title="class in jcgp.backend.modules.problem">Problem</a></h3>
+<code><a href="../../../../jcgp/backend/modules/problem/Problem.html#getBestFitness--">getBestFitness</a>, <a href="../../../../jcgp/backend/modules/problem/Problem.html#getFileExtension--">getFileExtension</a>, <a href="../../../../jcgp/backend/modules/problem/Problem.html#getFitnessOrientation--">getFitnessOrientation</a>, <a href="../../../../jcgp/backend/modules/problem/Problem.html#getFunctionSet--">getFunctionSet</a>, <a href="../../../../jcgp/backend/modules/problem/Problem.html#reset--">reset</a></code></li>
+</ul>
+<ul class="blockList">
+<li class="blockList"><a name="methods.inherited.from.class.jcgp.backend.modules.Module">
+<!-- -->
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+<h3>Methods inherited from class&nbsp;jcgp.backend.modules.<a href="../../../../jcgp/backend/modules/Module.html" title="class in jcgp.backend.modules">Module</a></h3>
+<code><a href="../../../../jcgp/backend/modules/Module.html#getLocalParameters--">getLocalParameters</a>, <a href="../../../../jcgp/backend/modules/Module.html#toString--">toString</a></code></li>
+</ul>
+<ul class="blockList">
+<li class="blockList"><a name="methods.inherited.from.class.java.lang.Object">
+<!-- -->
+</a>
+<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
+<code>equals, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+<div class="details">
+<ul class="blockList">
+<li class="blockList">
+<!-- ========= CONSTRUCTOR DETAIL ======== -->
+<ul class="blockList">
+<li class="blockList"><a name="constructor.detail">
+<!-- -->
+</a>
+<h3>Constructor Detail</h3>
+<a name="SymbolicRegressionProblem-jcgp.backend.resources.Resources-">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>SymbolicRegressionProblem</h4>
+<pre>public&nbsp;SymbolicRegressionProblem(<a href="../../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a>&nbsp;resources)</pre>
+<div class="block">Creates a new instance of SymbolicRegressionProblem.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>resources</code> - a reference to the experiment's resources.</dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+<!-- ============ METHOD DETAIL ========== -->
+<ul class="blockList">
+<li class="blockList"><a name="method.detail">
+<!-- -->
+</a>
+<h3>Method Detail</h3>
+<a name="evaluate-jcgp.backend.population.Population-jcgp.backend.resources.Resources-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>evaluate</h4>
+<pre>public&nbsp;void&nbsp;evaluate(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population,
+ <a href="../../../../jcgp/backend/resources/Resources.html" title="class in jcgp.backend.resources">Resources</a>&nbsp;resources)</pre>
+<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/Problem.html#evaluate-jcgp.backend.population.Population-jcgp.backend.resources.Resources-">Problem</a></code></span></div>
+<div class="block">The most important method of the problem type. This is called once
+ per generation, when the new population has been generated.
+ <br><br>
+ The basic functionality of this method is to loop through all chromosomes
+ in the population and decode them according to the problem type. The
+ fitness of each chromosome is then calculated using the problem data
+ or otherwise (subjective problem types such as art generation might
+ leave fitness evaluations up to the user) and assigned to the appropriate
+ chromosome.
+ <br><br>
+ In addition, realisations of this method should update the value of
+ bestFitness as appropriate, since the value of this parameter is displayed
+ if a GUI is in use.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../jcgp/backend/modules/problem/Problem.html#evaluate-jcgp.backend.population.Population-jcgp.backend.resources.Resources-">evaluate</a></code>&nbsp;in class&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/Problem.html" title="class in jcgp.backend.modules.problem">Problem</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>population</code> - the population to be evaluated.</dd>
+<dd><code>resources</code> - parameters and utilities for optional reference.</dd>
+</dl>
+</li>
+</ul>
+<a name="parseTestCase-java.lang.String:A-java.lang.String:A-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>parseTestCase</h4>
+<pre>public&nbsp;<a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.TestCase.html" title="class in jcgp.backend.modules.problem">TestCaseProblem.TestCase</a>&lt;java.lang.Double&gt;&nbsp;parseTestCase(java.lang.String[]&nbsp;inputs,
+ java.lang.String[]&nbsp;outputs)</pre>
+<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/TestCaseProblem.html#parseTestCase-java.lang.String:A-java.lang.String:A-">TestCaseProblem</a></code></span></div>
+<div class="block">This method is used internally by <code>addTestCase()</code> in order
+ to appropriately parse strings into the right data type for the
+ test cases. Since the data type is problem-dependent, subclasses must
+ implement this method. This method must return a built <code>TestCase</code>
+ object from the arguments given.</div>
+<dl>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>inputs</code> - the inputs represented as strings.</dd>
+<dd><code>outputs</code> - the outputs represented as strings.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the parsed test case.</dd>
+</dl>
+</li>
+</ul>
+<a name="perfectSolutionFound-jcgp.backend.population.Population-">
+<!-- -->
+</a>
+<ul class="blockList">
+<li class="blockList">
+<h4>perfectSolutionFound</h4>
+<pre>public&nbsp;int&nbsp;perfectSolutionFound(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</pre>
+<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/Problem.html#perfectSolutionFound-jcgp.backend.population.Population-">Problem</a></code></span></div>
+<div class="block">Used to assert whether a given population contains a perfect solution
+ to the problem. It is up to the problem to define what qualifies
+ a perfect solution, as some problems (subject ones such as music and
+ art evolution, for example) might not have perfect solutions at all.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../jcgp/backend/modules/problem/Problem.html#perfectSolutionFound-jcgp.backend.population.Population-">perfectSolutionFound</a></code>&nbsp;in class&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/Problem.html" title="class in jcgp.backend.modules.problem">Problem</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>population</code> - the population to search through for a perfect chromosome.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the perfect solution index, if one exits, -1 if no perfect solution was found.</dd>
+</dl>
+</li>
+</ul>
+<a name="hasImprovement-jcgp.backend.population.Population-">
+<!-- -->
+</a>
+<ul class="blockListLast">
+<li class="blockList">
+<h4>hasImprovement</h4>
+<pre>public&nbsp;int&nbsp;hasImprovement(<a href="../../../../jcgp/backend/population/Population.html" title="class in jcgp.backend.population">Population</a>&nbsp;population)</pre>
+<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/Problem.html#hasImprovement-jcgp.backend.population.Population-">Problem</a></code></span></div>
+<div class="block">Used to assert whether a given population has a chromosome that is an improvement over
+ the current best chromosome. A typical implementation of this method
+ will simply compare chromosome fitness values, though the problem type
+ is free to implement this in any way.</div>
+<dl>
+<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
+<dd><code><a href="../../../../jcgp/backend/modules/problem/Problem.html#hasImprovement-jcgp.backend.population.Population-">hasImprovement</a></code>&nbsp;in class&nbsp;<code><a href="../../../../jcgp/backend/modules/problem/Problem.html" title="class in jcgp.backend.modules.problem">Problem</a></code></dd>
+<dt><span class="paramLabel">Parameters:</span></dt>
+<dd><code>population</code> - the population potentially containing a fitter chromosome.</dd>
+<dt><span class="returnLabel">Returns:</span></dt>
+<dd>the index of the first chromosome in the population that is an improvement, -1 if none is found.</dd>
+</dl>
+</li>
+</ul>
+</li>
+</ul>
+</li>
+</ul>
+</div>
+</div>
+<!-- ========= END OF CLASS DATA ========= -->
+<!-- ======= START OF BOTTOM NAVBAR ====== -->
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+<div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div>
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