diff --git a/examples/tools.h b/examples/tools.h
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+/**************************************************************************************************
+*                                                                                                 *
+* This file is part of HPMPC.                                                                     *
+*                                                                                                 *
+* HPMPC -- Library for High-Performance implementation of solvers for MPC.                        *
+* Copyright (C) 2014-2015 by Technical University of Denmark. All rights reserved.                *
+*                                                                                                 *
+* HPMPC is free software; you can redistribute it and/or                                          *
+* modify it under the terms of the GNU Lesser General Public                                      *
+* License as published by the Free Software Foundation; either                                    *
+* version 2.1 of the License, or (at your option) any later version.                              *
+*                                                                                                 *
+* HPMPC is distributed in the hope that it will be useful,                                        *
+* but WITHOUT ANY WARRANTY; without even the implied warranty of                                  *
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                                            *
+* See the GNU Lesser General Public License for more details.                                     *
+*                                                                                                 *
+* You should have received a copy of the GNU Lesser General Public                                *
+* License along with HPMPC; if not, write to the Free Software                                    *
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA                  *
+*                                                                                                 *
+* Author: Gianluca Frison, giaf (at) dtu.dk                                                       *
+*                                                                                                 *
+**************************************************************************************************/
+
+void dgemm_nn_3l(int m, int n, int k, double *A, int lda , double *B, int ldb, double *C, int ldc);
+void daxpy_3l(int n, double da, double *dx, double *dy);
+void dscal_3l(int n, double da, double *dx);
+
+/* copies a matrix into another matrix */
+void dmcopy(int row, int col, double *ptrA, int lda, double *ptrB, int ldb);
+
+/* solution of a system of linear equations */
+void dgesv_3l(int n, int nrhs, double *A, int lda, int *ipiv, double *B, int ldb, int *info);
+
+/* matrix exponential */
+void expm(int row, double *A);