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diff --git a/src/c/matrixOperations/includes/matrixTrace.h b/src/c/matrixOperations/includes/matrixTrace.h
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2008-2008 - INRIA - Allan SIMON
+ *
+ *  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 __MATRICXTRACE_H__
+#define __MATRICXTRACE_H__
+
+#include "dynlib_matrixoperations.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+/*
+**
+** WARNING WE ASSUME MATRIXES TO BE SQUARE
+** 
+*/
+
+
+/*
+** \brief Compute the trace of a float scalar  matrix.
+** \param in : input array.
+** \param lines : number of lines  
+** \param out : float scalar containing the trace.
+*/
+
+EXTERN_MATOPS float stracea ( float* in ,int lines ) ;
+
+
+/*
+** \brief Compute the trace of a double scalar  matrix.
+** \param in : input array.
+** \param lines : number of lines  
+** \param out : double scalar containing the trace.
+*/
+EXTERN_MATOPS double dtracea ( double* in ,int lines ) ;
+
+/*
+** \brief Compute the trace of a float complex  matrix.
+** \param in : input array.
+** \param lines : number of lines  
+** \param out : float complex containing the trace.
+*/
+EXTERN_MATOPS floatComplex ctracea ( floatComplex* in ,int lines ) ;
+
+
+/*
+** \brief Compute the trace of a double complex  matrix.
+** \param in : input array.
+** \param lines : number of lines  
+** \param out : double complex containing the trace.
+*/
+EXTERN_MATOPS doubleComplex ztracea ( doubleComplex* in ,int lines ) ;
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+#endif /* !__MATRICXTRACE_H__ */