From 1436a72c265954a796081cf3708f93c8a6aff9ae Mon Sep 17 00:00:00 2001
From: devra <devra@Framework.fritz.box>
Date: Mon, 8 Jan 2024 22:04:31 +0100
Subject: [PATCH] Standardabweichung implementiert

---
 .../informatik/spreadsheet/Spreadsheet.java   | 45 +++++++++++++++++--
 1 file changed, 41 insertions(+), 4 deletions(-)

diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 8e43a72..f01ed5a 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -174,9 +174,16 @@ public class Spreadsheet {
 			
 		
 		
-		else if (formula.startsWith("STABW("))  // e.g. STABW(C6:D8) -> Standardabweichung
-			result = "TODO"; // TODO
-		else if (formula.startsWith("MIN("))  // e.g. MIN(C13:H13) -> größter Wert
+		else if (formula.startsWith("STABW(")) {  // e.g. STABW(C6:D8) -> Standardabweichung
+			String[] onlyCells = formula.substring(6, formula.length() - 1).split(":");
+			
+			if(checkIfCellExists(onlyCells[0])&&checkIfCellExists(onlyCells[1])) {
+				result = "" + statbw(onlyCells[0], onlyCells[1]);
+			}
+			
+		}	
+			
+					else if (formula.startsWith("MIN("))  // e.g. MIN(C13:H13) -> größter Wert
 			result = "TODO"; // TODO
 		else if (formula.startsWith("MAX("))  // e.g. MAX(A1:A10) -> Standardabweichung
 			result = "TODO"; // TODO
@@ -193,6 +200,8 @@ public class Spreadsheet {
 
 	
 
+	
+
 	/**
 	 * Method for calculating the sum of a rectangular block of cells, such as from A1 to B3.
 	 * @param startCellName The name of the cell in the upper left corner of the rectangle.
@@ -209,7 +218,7 @@ public class Spreadsheet {
 		return summe;
 	}
 	
-	
+//	TODO: Javadoc comments
 	private long pro(String startCellName, String endCellName) {
 		int werte[]=getValues(startCellName,endCellName);
 		
@@ -220,6 +229,7 @@ public class Spreadsheet {
 		return produkt;
 	}
 	
+//	TODO: Javadoc comments
 	private long mit(String startCellName, String endCellName) {
 		int werte[]=getValues(startCellName,endCellName);
 		
@@ -231,6 +241,33 @@ public class Spreadsheet {
 		
 	}
 
+//	TODO: Javadoc comments
+	private double statbw(String startCellName, String endCellName) {
+		int werte[]=getValues(startCellName,endCellName);
+		
+		if (werte.length < 2) {
+	        return 0;  				// Die Standardabweichung für weniger als zwei Werte ist 0
+	    }
+				
+		double summe = 0.0;
+	    for (double i : werte) {
+	        summe += i;
+	    }
+
+	    // Durchschnitt des Arrays berechnen
+	    double mittel = summe / werte.length;
+
+	    // abweichung zum mittelwert berchnen und quadrieren
+	    double standardDeviation = 0.0;
+	    for (double wert : werte) {
+	        standardDeviation += Math.pow(wert - mittel, 2);
+	    }
+
+	    return Math.sqrt(standardDeviation / werte.length);
+	}
+	
+	
+	
 //	TODO: Javadoc comments
 	private int[] getValues(String startCellName, String endCellName) {
 		int startZeile=getRow(startCellName);