- added the #define for eo_verbose (true) and eo_no_verbose (false)

- added the eoNormMutation, simple normal mutation for simple real variables
Modified Files:
 	src/eo src/es/eoRealOp.h tutorial/Lesson2/FirstRealEA.cpp
 	tutorial/Lesson3/SecondBitEA.cpp

eo/src/eo

@@ -28,6 +28,10 @@
 #ifndef _eo_
 #define _eo_
 
+// some defines to make things easier to get at first sight
+
+#define eo_verbose true
+#define eo_no_verbose false
 //-----------------------------------------------------------------------------
 
 #include <utils/eoData.h>

eo/src/es/eoRealOp.h

@@ -61,14 +61,17 @@ template<class Chrom> class eoUniformMutation: public eoMonOp<Chrom>
    */
   void operator()(Chrom& chrom) 
     {
-      chrom.invalidate();
+      bool hasChanged=false;
       for (unsigned lieu=0; lieu<chrom.size(); lieu++) 
 	{
 	  if (rng.flip(p_change)) 
 	    {
 	      chrom[lieu] += 2*epsilon*rng.uniform()-epsilon;
+	      hasChanged = true;
 	    }
 	}
+      if (hasChanged)
+	chrom.invalidate();
     }
   
 private:
@@ -117,6 +120,45 @@ private:
 };
 
 
+template<class Chrom> class eoNormalMutation: public eoMonOp<Chrom>
+{
+ public:
+  /**
+   * (Default) Constructor.
+   * @param _epsilon the range for uniform nutation
+   * @param _p_change the probability to change a given coordinate
+   */
+  eoNormalMutation(const double& _epsilon, const double& _p_change = 1.0): 
+    epsilon(_epsilon), p_change(_p_change) {}
+
+  /// The class name.
+  string className() const { return "eoNormalMutation"; }
+  
+  /**
+   * Do it!
+   * @param chrom The cromosome undergoing the mutation
+   */
+  void operator()(Chrom& chrom) 
+    {
+      bool hasChanged=false;
+      for (unsigned lieu=0; lieu<chrom.size(); lieu++) 
+	{
+	  if (rng.flip(p_change)) 
+	    {
+	      chrom[lieu] += epsilon*rng.normal();
+	      hasChanged = true;
+	    }
+	}
+      if (hasChanged)
+	chrom.invalidate();
+    }
+  
+private:
+  double epsilon;
+  double p_change;
+};
+
+
 // two arithmetical crossovers
 
 /** eoSegmentCrossover --> uniform choice in segment 

eo/tutorial/Lesson2/FirstRealEA.cpp

@@ -45,11 +45,13 @@ void main_function(int argc, char **argv)
   const float P_MUT = 0.5;	// mutation probability
 
   const double EPSILON = 0.01;	// range for real uniform mutation
+  const double SIGMA   = 0.01;	// std. dev. of normal mutation
   // some parameters for chosing among different operators
   const double segmentRate = 0.5;     // rate for 1-pt Xover
   const double arithmeticRate = 0.5;     // rate for 2-pt Xover
   const double uniformMutRate = 0.5;      // rate for bit-flip mutation
   const double detMutRate = 0.5;       // rate for one-bit mutation
+  const double normMutRate = 0.5;       // rate for normal mutation
 
 // GENERAL
   //////////////////////////
@@ -113,16 +115,19 @@ void main_function(int argc, char **argv)
   eoArithmeticCrossover<Indi> xoverA;
   // Combine them with relative rates
   eoPropCombinedQuadOp<Indi> xover(xoverS, segmentRate);
-  xover.add(xoverA, arithmeticRate, true);
+  xover.add(xoverA, arithmeticRate, eo_verbose);
 
 // MUTATION
+  // Gaussian mutation - std dev as argument
+  eoNormalMutation<Indi>  mutationN(SIGMA); 
   // offspring(i) uniformly chosen in [parent(i)-epsilon, parent(i)+epsilon]
   eoUniformMutation<Indi>  mutationU(EPSILON); 
   // k (=1) coordinates of parents are uniformly modified
   eoDetUniformMutation<Indi>  mutationD(EPSILON); 
   // Combine them with relative rates
   eoPropCombinedMonOp<Indi> mutation(mutationU, uniformMutRate);
-  mutation.add(mutationD, detMutRate, true);
+  mutation.add(mutationD, detMutRate);
+  mutation.add(mutationN, normMutRate, eo_verbose);
 
 // STOP
 // CHECKPOINT

eo/tutorial/Lesson3/SecondBitEA.cpp

@@ -235,7 +235,7 @@ void main_function(int argc, char **argv)
   // Combine them with relative rates
   eoPropCombinedQuadOp<Indi> xover(xover1, onePointRate);
   xover.add(xoverU, URate);
-  xover.add(xover2, twoPointsRate, true);
+  xover.add(xover2, twoPointsRate, eo_verbose);
 
 // MUTATION
   // standard bit-flip mutation for bitstring
@@ -244,7 +244,7 @@ void main_function(int argc, char **argv)
   eoDetBitFlip<Indi> mutationOneBit; 
   // Combine them with relative rates
   eoPropCombinedMonOp<Indi> mutation(mutationBitFlip, bitFlipRate);
-  mutation.add(mutationOneBit, oneBitRate, true);
+  mutation.add(mutationOneBit, oneBitRate, eo_verbose);
 
   // The operators are  encapsulated into an eoTRansform object
   eoSGATransform<Indi> transform(xover, pCross, mutation, pMut);
@@ -294,7 +294,7 @@ void main_function(int argc, char **argv)
     checkpoint.add(SecondStat);
 
     // The Stdout monitor will print parameters to the screen ...
-    eoStdoutMonitor monitor(false);
+    eoStdoutMonitor monitor(eo_no_verbose);
      
     // when called by the checkpoint (i.e. at every generation)
     checkpoint.add(monitor);