#169: Fix ES description.

org.jenetics.doc/src/main/lyx/manual.lyx

@@ -20044,12 +20044,12 @@ final Engine<DoubleGene, Double> engine =
 
 \begin_layout Plain Layout
 
-        .survivorsSize(mu)
+        .survivorsSize(0)
 \end_layout
 
 \begin_layout Plain Layout
 
-        .selector(new TruncationSelector<>(mu))
+        .offspringSelector(new TruncationSelector<>(mu))
 \end_layout
 
 \begin_layout Plain Layout
@@ -20112,13 +20112,11 @@ reference "lis:mu-lambda-Engine-configuration"
 \end_inset
 
  and the survivors size to 
-\begin_inset Formula $\mu$
+\begin_inset Formula $0$
 \end_inset
 
-.
- This corresponds to first two steps of the ES.
- Step three is configured by setting the survivors- and offspring selectors
- to the 
+, since the best parents are not part of the final population.
+ Step three is configured by setting the offspring selector to the 
 \family typewriter
 Truncation\SpecialChar softhyphen
 Selector
@@ -20134,12 +20132,16 @@ Selector
 \end_inset
 
 .
- This parameterization prevents the selector from selecting individuals
- with a rank lower than 
+ This lets the 
+\family typewriter
+Truncation\SpecialChar softhyphen
+Selector
+\family default
+ only select the 
 \begin_inset Formula $\mu$
 \end_inset
 
-.
+ best individuals, which corresponds to step two of the ES.
 \end_layout
 
 \begin_layout Standard

org.jenetics.example/src/main/java/org/jenetics/example/MLStrategy.java

@@ -5,6 +5,7 @@
 import org.jenetics.TruncationSelector;
 import org.jenetics.engine.Codec;
 import org.jenetics.engine.Engine;
+import org.jenetics.engine.EvolutionResult;
 import org.jenetics.engine.codecs;
 import org.jenetics.util.DoubleRange;
 
@@ -37,10 +38,18 @@ public static void main(final String[] args) {
 		final Engine<DoubleGene, Double> engine = Engine
 			.builder(MLStrategy::fitness, codec)
 			.populationSize(λ)
-			.survivorsSize(μ)
-			.selector(new TruncationSelector<>(μ))
+			.survivorsSize(0)
+			.offspringSelector(new TruncationSelector<>(μ))
 			.alterers(new Mutator<>(p))
 			.build();
+
+		System.out.println(
+			codec.decode(
+				engine.stream()
+					.limit(100)
+					.collect(EvolutionResult.toBestGenotype())
+			)
+		);
 	}
 
 }