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diff --git a/src/elementaryFunctions/includes/atan.h b/src/elementaryFunctions/includes/atan.h
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+/*
+**  -*- C -*-
+**
+** atan.h
+** Made by  Bruno JOFRET <bruno.jofret@inria.fr>
+**
+** Started on  Tue Dec  5 15:49:18 2006 jofret
+** Last update Wed Sep  5 16:05:57 2007 bruno
+**
+** Copyright INRIA 2006
+*/
+
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+/*
+** Compute ArcTangeant for different types .
+*/
+
+/*
+** \brief Float ArcTangeant function
+** \param in : input value.
+*/
+float		satans(float in);
+
+/*
+** \brief Double ArcTangeant function
+** \param in : input value.
+*/
+double		datans(double in);
+
+/*
+** \brief Float Complex ArcTangeant function
+** \param in : input value.
+*/
+floatComplex	catans(floatComplex in);
+
+/*
+** \brief Double Complex ArcTangeant function
+** \param in : input value.
+*/
+doubleComplex	zatans(doubleComplex in);
+
+/*
+** \brief Float Matrix ArcTangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+void		satana(float* in, float* out, int size);
+
+/*
+** \brief Double Matrix ArcTangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+void		datana(double* in, double* out, int size);
+
+/*
+** \brief Float Complex Matrix ArcTangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+void		catana(floatComplex* in, floatComplex* out, int size);
+
+/*
+** \brief Double Complex Matrix ArcTangeant function
+** \param in : input array value.
+** \param out : input array value.
+** \param size : the size of in and out arrays.
+*/
+void		zatana(doubleComplex* in, doubleComplex* out, int size);
+
+