diff --git a/Code-C/growthrate.c b/Code-C/growthrate.c
new file mode 100644
index 0000000..2f8d4fc
--- /dev/null
+++ b/Code-C/growthrate.c
@@ -0,0 +1,39 @@
+#include "average.h"
+#include "getArray.h"
+#include "fileGestion.h"
+#include "initialParameters.h"
+#include "queue.h"
+
+/**
+ * @brief realize the growthRate calcul
+ * 
+ * @param p array with all the values that will be used for the calcul
+ * @param powerArray array where results are stocked
+ */
+void growthRateCalculation(long **p, double powerArray[]){
+    for(int i = 1; i < nCol; i++){
+        int j = 0;
+        powerArray[i] = 0;
+        while(j < nRow-1){
+            double aire  = ( pow(p[j][i],2) + pow(p[j+1][i],2) ) / 2 * period;
+            powerArray[i] += aire;
+            j++;
+        }
+        powerArray[i] *= invTimeBandWidth;
+    }
+}
+
+/**
+ * @brief function that realize all the action to write one lign in the file growthRateData.csv
+ * 
+ * @param rawDataFileName name of the raw data file to use to realize the calcul
+ */
+void growthRate(char* rawDataFileName){
+    long **p = getRawDataArray(rawDataFileName), ;
+    double gRate[nCol -1];
+    if(p !=NULL){
+        growthRateCalculation(p,gRate);
+        appendDataInFile("averageData.csv",aver,nCol-1);
+        freeArray(p,nRow);
+    }
+}
\ No newline at end of file
diff --git a/Code-C/growthrate.h b/Code-C/growthrate.h
new file mode 100644
index 0000000..107db51
--- /dev/null
+++ b/Code-C/growthrate.h
@@ -0,0 +1,4 @@
+#include <math.h>
+#include <stdbool.h>
+
+void growthRate(char* rawDataFileName);
\ No newline at end of file
diff --git a/Code-C/main b/Code-C/main
index 46f740e..d66df7a 100755
Binary files a/Code-C/main and b/Code-C/main differ
diff --git a/Code-C/main.c b/Code-C/main.c
index a66d853..1264c28 100644
--- a/Code-C/main.c
+++ b/Code-C/main.c
@@ -61,6 +61,19 @@ void *threadCalculBoth(void *vargp){
     }
 }
 
+void *threadGrowthRate(void *vargp){
+    Pqueue rawDataQueue = firstRawDataQueue;
+    char* fileName;
+    while(rawDataWriteFlag){
+        while(queueGetNextE(rawDataQueue) != NULL){
+            rawDataQueue = queueGetNextE(rawDataQueue);
+            fileName = queueGetTabChar(rawDataQueue);
+            GrowthRate(fileName);
+            remove(fileName);
+        }
+    }
+}
+
 
 int main(int argc , char** argv){
 
diff --git a/Code-C/power.c b/Code-C/power.c
index 66f4f75..6ac6709 100644
--- a/Code-C/power.c
+++ b/Code-C/power.c
@@ -30,7 +30,7 @@ void powerCalculation(long **p, double powerArray[]){
  * @param N number of rows in the file
  * @param M number of columns in the file
  */
-void power(char* rawDataFileName){
+double * power(char* rawDataFileName){
     long **p = getRawDataArray(rawDataFileName);
     double pw[nCol-1];
     if(p !=NULL){
@@ -38,4 +38,5 @@ void power(char* rawDataFileName){
         appendDataInFile("powerData.csv",pw,nCol-1);
         freeArray(p,nRow);
     }
+    return pw;
 }
\ No newline at end of file