--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/fixings/LogLinearFittingOperation.java	Mon Dec 02 17:56:15 2019 +0100
@@ -0,0 +1,52 @@
+/** Copyright (C) 2017 by Bundesanstalt für Gewässerkunde
+ * Software engineering by
+ *  Björnsen Beratende Ingenieure GmbH
+ *  Dr. Schumacher Ingenieurbüro für Wasser und Umwelt
+ *
+ * This file is Free Software under the GNU AGPL (>=v3)
+ * and comes with ABSOLUTELY NO WARRANTY! Check out the
+ * documentation coming with Dive4Elements River for details.
+ */
+package org.dive4elements.river.artifacts.model.fixings;
+
+import java.util.List;
+
+import org.dive4elements.river.artifacts.math.fitting.LogLinearAlternative;
+import org.dive4elements.river.artifacts.model.fixings.fitting.LinearLogLinearizedFitting;
+import org.dive4elements.river.artifacts.model.fixings.fitting.LinearLogLinearizedFitting.Result;
+
+/**
+ * @author Gernot Belger
+ */
+final class LogLinearFittingOperation extends AbstractFittingOperation implements IFittingOperation {
+
+    public LogLinearFittingOperation(final LogLinearAlternative function) {
+        super(function);
+    }
+
+    @Override
+    public Fitting execute(final List<FittingData> data) {
+
+        final double[] obsDischarges = new double[data.size()];
+        final double[] obsWaterlevels = new double[data.size()];
+
+        for (int i = 0; i < data.size(); i++) {
+            final FittingData fittingData = data.get(i);
+
+            obsDischarges[i] = fittingData.q;
+            obsWaterlevels[i] = fittingData.w;
+        }
+
+        final LinearLogLinearizedFitting fitting = new LinearLogLinearizedFitting(obsDischarges, obsWaterlevels);
+
+        final Result result = fitting.optimize();
+        final double a = result.getA();
+        final double b = result.getB();
+        final double m = result.getM();
+        final double chiSquare = result.getChiSquare();
+
+        final double[] parameters = new double[] { a, m, b };
+
+        return createFitting(parameters, chiSquare, data);
+    }
+}
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