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diff --git a/2.3-1/src/c/auxiliaryFunctions/includes/isnan.h b/2.3-1/src/c/auxiliaryFunctions/includes/isnan.h
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+++ b/2.3-1/src/c/auxiliaryFunctions/includes/isnan.h
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2007-2008 - 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
+ *
+ */
+
+#ifndef __IS_NAN_H__
+#define __IS_NAN_H__
+
+#include <math.h>
+#include "dynlib_auxiliaryfunctions.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+/*
+** \brief Float Is Nan function
+*/
+EXTERN_AUXFUNCT float	sisnans(float x);
+
+/*
+** \brief Double Is Nan function
+*/
+EXTERN_AUXFUNCT double disnans(double x);
+
+/*
+** \brief Float Complex Is Nan function
+*/
+EXTERN_AUXFUNCT float	cisnans(floatComplex z);
+
+/*
+** \brief Double Complex Is Nan function
+*/
+EXTERN_AUXFUNCT double zisnans(doubleComplex z);
+
+/*
+** \brief Float Is Nan function
+*/
+EXTERN_AUXFUNCT void	sisnana(float* x, int size, float* out);
+
+/*
+** \brief Double Is Nan function
+*/
+EXTERN_AUXFUNCT void disnana(double* x, int size, double* out);
+
+/*
+** \brief Float Complex Is Nan function
+*/
+EXTERN_AUXFUNCT void	cisnana(floatComplex* z, int size, float* out);
+
+/*
+** \brief Double Complex Is Nan function
+*/
+EXTERN_AUXFUNCT void zisnana(doubleComplex* z, int size, double* out);
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+
+
+#endif /* !__IS_NAN_H__ */