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diff --git a/src/c/matrixOperations/multiplication/dmulma.c b/src/c/matrixOperations/multiplication/dmulma.c
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+/*
+ *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+ *  Copyright (C) 2008-2008 - 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 WITHOUT_BLAS
+#include "lapack.h"
+#endif
+#include "matrixMultiplication.h"
+
+/*
+** \brief Compute a multiplication for doubles matrixes.
+** \param in1 : input matrix.
+** \param lines1 : lines of in1 matrix.
+** \param columns1 : columns of in1 matrix.
+** \param in2 : input arry.
+** \param lines2 : lines of in2 matrix.
+** \param columns2 : columns of in2 matrix.
+** \param out : Matrix that contains the multiplication in1 * in2.
+*/
+void	dmulma(double *in1, int lines1, int columns1,
+	       double *in2, int lines2, int columns2,
+	       double *out)
+{
+#ifndef WITHOUT_BLAS
+  /*
+  ** USES BLAS DGEMM FUNCTION.
+  */
+  double One		= 1;
+  double Zero		= 0;
+
+  /* Cr <-  1*Ar*Br + 0*Cr */
+  dgemm_("N","N", &lines1, &columns2, &columns1, &One,
+	 in1 , &lines1, in2, &lines2, &Zero, out, &lines1);
+#else
+  /*
+  ** DO NOT USE ANY BLAS FUNCTION.
+  */
+  int i = 0;
+  int k = 0;
+  double accu = 0;
+
+  /*
+  **  How to convert 2 index matrixes to one.
+  ** #define in1(a, b)	in1[a+b*lines1]
+  ** #define in2(c, d)	in2[c+d*lines2]
+  */
+
+  for (i = 0 ; i < lines1 * columns2 ; ++i)
+    {
+      accu = 0;
+      for (k = 0; k < columns1 ; ++k)
+	{
+	  accu += in1[i % lines1 + k * lines1]
+	    * in2[k + (i / lines1) * lines2];
+	}
+      out[i] = accu;
+    }
+#endif
+}