Merge pull request #221 from tbeu/add-ClassicModelFixedStartValues

Add ClassicModelFixedStartValues

Author: Michael Tiller

ModelicaByExample/BasicEquations/LotkaVolterra/ClassicModelFixedStartValues.mo

@@ -0,0 +1,18 @@
+within ModelicaByExample.BasicEquations.LotkaVolterra;
+model ClassicModelFixedStartValues "This is the typical equation-oriented model"
+  parameter Real alpha=0.1 "Reproduction rate of prey";
+  parameter Real beta=0.02 "Mortality rate of predator per prey";
+  parameter Real gamma=0.4 "Mortality rate of predator";
+  parameter Real delta=0.02 "Reproduction rate of predator per prey";
+  parameter Real x0=10 "Initial prey population";
+  parameter Real y0=10 "Initial predator population";
+  Real x(
+    start=x0,
+    fixed=true) "Prey population";
+  Real y(
+    start=y0,
+    fixed=true) "Predator population";
+equation
+  der(x) = x*(alpha-beta*y);
+  der(y) = y*(delta*x-gamma);
+end ClassicModelFixedStartValues;