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diff --git a/src/c/elementaryFunctions/nanmean/dnanmeana.c b/src/c/elementaryFunctions/nanmean/dnanmeana.c
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+++ b/src/c/elementaryFunctions/nanmean/dnanmeana.c
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+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ This file must be used under the terms of the CeCILL.
+ This source file is licensed as described in the file COPYING, which
+ you should have received as part of this distribution.  The terms
+ are also available at
+ http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ Author: Brijesh Gupta C R
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "nanmean.h"
+
+double dnanmeana(double* in, int size)
+{
+    double count = 0, sum = 0;
+
+    for(int i = 0; i<size; i++)
+    {
+        if(!(isnan(in[i])))
+        {
+            count++;
+            sum += in[i];
+        }
+    }
+
+    return sum/count;
+}
+