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diff --git a/src/c/elementaryFunctions/atan/zatana.c b/src/c/elementaryFunctions/atan/zatana.c
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2006-2008 - INRIA - Bruno JOFRET
+ *
+ *  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
+ *
+ */
+
+#include "atan.h"
+
+void zatana(doubleComplex* x, int size, doubleComplex* y) {
+  int i = 0;
+  for (i = 0; i < size; ++i) {
+    y[i] = zatans(x[i]);
+  }
+}