--- a/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Function.java	Wed May 23 13:48:20 2012 +0000
+++ b/flys-artifacts/src/main/java/de/intevation/flys/artifacts/math/fitting/Function.java	Wed May 23 18:27:45 2012 +0000
@@ -1,5 +1,7 @@
 package de.intevation.flys.artifacts.math.fitting;
 
+import org.apache.commons.math.FunctionEvaluationException;
+
 import org.apache.commons.math.optimization.fitting.ParametricRealFunction;
 
 import de.intevation.flys.utils.DoubleUtil;
@@ -53,5 +55,22 @@
     public double [] getInitialGuess() {
         return initialGuess;
     }
+
+    public de.intevation.flys.artifacts.math.Function instantiate(
+        final double [] parameters
+    ) {
+        return new de.intevation.flys.artifacts.math.Function() {
+
+            @Override
+            public double value(double x) {
+                try {
+                    return Function.this.value(x, parameters);
+                }
+                catch (FunctionEvaluationException fee) {
+                    return Double.NaN;
+                }
+            }
+        };
+    }
 }
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