Added clear for regressionseries

src/main/java/com/application/GUI/LineChartFunctionality.java

@@ -377,7 +377,7 @@ public class LineChartFunctionality {
              */
 
 
-
+            getRegressionSeries().getData().clear();
             getRegressionSeries().getData().add(new XYChart.Data<String, Number>(
                     String.valueOf(i),
                     getNonLinearRegression(