diff --git a/MMS24_25.h b/MMS24_25.h
index 91ee884..5a751d9 100644
--- a/MMS24_25.h
+++ b/MMS24_25.h
@@ -1,27 +1,28 @@
-//
-// Created by frederikbeimgraben, minhdancam, leahornberger on 03.12.2024.
-//
+#ifndef MMS24_25_H_
+#define MMS24_25_H_
 
-#ifndef MMS24_25_H
-#define MMS24_25_H
+typedef struct {
+        int iNumLocalExtrema;
+        int *piLocalExtremaPos;
+} LocalExtrema;
+
+typedef struct {
+        int iGlobalMinPos;
+        int iGlobalMaxPos;
+        LocalExtrema *pexLocalMax;
+        LocalExtrema *pexLocalMin;
+} Extrema;
 
 typedef struct {
   double *pdValues;
   int iNumValues;
+  double dArea;
+  double dMean;
+  double dStdDev;
+  double dMedian;
+  Extrema *pexExtrema;
 } MMSignal;
 
-typedef struct {
-	int iNumLocalExtrema;
-	int *piLocalExtremaPos;
-} LocalExtrema;
-
-typedef struct {
-	int iGlobalMinPos;
-	int iGlobalMaxPos;
-	LocalExtrema *pexLocalMax;
-	LocalExtrema *pexLocalMin;
-} Extrema;
-
 typedef struct {
 	double dIntervalMin;
 	double dIntervalMax;
@@ -53,9 +54,10 @@ void writeDoubleArray(double *pdOut, int iLen, char *pcOutName);
 int readDoubleArray(char *pcInName, double **ppdIn);
 
 MMSignal *createSignal();
+MMSignal *createSignalFromSignal(MMSignal *pmmsIn);
+MMSignal *createSignalWithDefault(int iArrayLen, double dDefaultValue);
 MMSignal *createSignalFromDoubleArray(int iArrayLen, double *pdIn);
 MMSignal *createSignalFromFile(char *pcInName);
-MMSignal *readMMSignal(char *pcInName);
 void writeMMSignal(char *pcInName, MMSignal *pmmsIn);
 
 void deleteSignal(MMSignal *pmmsIn);
@@ -70,6 +72,8 @@ double calculateStddev(double *pdIn, int iLen);
 double calculateMedian(double *pdIn, int iLen);
 Extrema *initExtrema(double *pdIn, int iLen);
 void deleteExtrema(Extrema *pexIn);
+void initMMSignalFeatures(MMSignal *pmmsIn);
+
 Histogram *initHistogram(double *pdIn, int iLen, int iNumBins);
 void deleteHistogram(Histogram *phisIn);
 double calculateEntropy(Histogram *phisIn);
@@ -78,11 +82,15 @@ double calculateEntropy(Histogram *phisIn);
 * AUFGABE 3
 ********************************/
 MMSignal *convoluteSignals(MMSignal *pmmsInA,MMSignal *pmmsInB);
-double *getPascalLine(int iLinenum);
+MMSignal *getPascalLine(int iLinenum);
 
 /********************************
 * AUFGABE 4
 ********************************/
-
-#endif //MMS24_25_H
-
+void computeDFT(int iLen,
+		double *pdRealIn, double *pdImgIn,
+		double *pdRealOut, double *pdImgOut,
+		int iDirection /*-1,1*/);
+void convertCart2Polar(double *pdRealIn, double *pdImgIn,double *pdRadiusOut, double *pdAngleOut, int iLen);
+void convertPolar2Cart(double *pdRadiusIn, double *pdAngleIn, double *pdRealOut, double *pdImgOut,int iLen);
+#endif