initialize_variables.html ( File view )

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      <title>initialize_variables</title>
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      <h2>Contents</h2>
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         <ul>
            <li><a href="#1">function f = initialize_variables(N, M, V, min_tange, max_range)</a></li>
            <li><a href="#2">Initialize each chromosome</a></li>
         </ul>
      </div>
      <h2>function f = initialize_variables(N, M, V, min_tange, max_range)<a name="1"></a></h2>
      <p>This function initializes the chromosomes. Each chromosome has the following at this stage       * set of decision variables
               * objective function values
      </p>
      <p>where, N - Population size M - Number of objective functions V - Number of decision variables min_range - A vector of decimal
         values which indicate the minimum value for each decision variable. max_range - Vector of maximum possible values for decision
         variables.
      </p><pre class="codeinput">min = min_range;
max = max_range;

<span class="comment">% K is the total number of array elements. For ease of computation decision</span>
<span class="comment">% variables and objective functions are concatenated to form a single</span>
<span class="comment">% array. For crossover and mutation only the decision variables are used</span>
<span class="comment">% while for selection, only the objective variable are utilized.</span>

K = M + V;
</pre><h2>Initialize each chromosome<a name="2"></a></h2>
      <p>For each chromosome perform the following (N is the population size)</p><pre class="codeinput"><span class="keyword">for</span> i = 1 : N
    <span class="comment">% Initialize the decision variables based on the minimum and maximum</span>
    <span class="comment">% possible values. V is the number of decision variable. A random</span>
    <span class="comment">% number is picked between the minimum and maximum possible values for</span>
    <span class="comment">% the each decision variable.</span>
    <span class="keyword">for</span> j = 1 : V
        f(i,j) = min(j) + (max(j) - min(j))*rand(1);
    <span class="keyword">end</span>
    <span class="comment">% For ease of computation and handling data the chromosome also has the</span>
    <span class="comment">% vlaue of the objective function concatenated at the end. The elements</span>
    <span class="comment">% V + 1 to K has the objective function valued.</span>
    <span class="comment">% The function evaluate_objective takes one chromosome at a time,</span>
    <span class="comment">% infact only the decision variables are passed to the function along</span>
    <span class="comment">% with information about the number of objective functions which are</span>
    <span class="comment">% processed and returns the value for the objective functions. These</span>
    <span class="comment">% values are now stored at the end of the chromosome itself.</span>
    f(i,V + 1: 
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