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diff --git a/src/c/elementaryFunctions/includes/log2.h b/src/c/elementaryFunctions/includes/log2.h
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+++ b/src/c/elementaryFunctions/includes/log2.h
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+ /* Copyright (C) 2017 - 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
+ */
+
+#ifndef __LOG2_H__
+#define __LOG2_H__
+
+#include "dynlib_elementaryfunctions.h"
+#include "floatComplex.h"
+#include "doubleComplex.h"
+#include "types.h"
+#include "log.h"
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+double dlog2s(double inp);
+float slog2s(float inp);
+doubleComplex zlog2s(doubleComplex inp);
+void dlog2a(double* inp,int size, double* out);
+void slog2a(float* inp,int size, float* out);
+void zlog2a(doubleComplex* inp,int size, doubleComplex* out);
+
+#ifdef  __cplusplus
+} /* extern "C" */
+#endif
+
+
+#endif /* !__LOG2_H__ */
+