1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
5//
6// This Source Code Form is subject to the terms of the Mozilla
7// Public License v. 2.0. If a copy of the MPL was not distributed
8// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9
10#include "binary_library.h"
11#include "stdio.h"
12
13void demo_MatrixXd()
14{
15  struct C_MatrixXd *matrix1, *matrix2, *result;
16  printf("*** demo_MatrixXd ***\n");
17
18  matrix1 = MatrixXd_new(3, 3);
19  MatrixXd_set_zero(matrix1);
20  MatrixXd_set_coeff(matrix1, 0, 1, 2.5);
21  MatrixXd_set_coeff(matrix1, 1, 0, 1.4);
22  printf("Here is matrix1:\n");
23  MatrixXd_print(matrix1);
24
25  matrix2 = MatrixXd_new(3, 3);
26  MatrixXd_multiply(matrix1, matrix1, matrix2);
27  printf("Here is matrix1*matrix1:\n");
28  MatrixXd_print(matrix2);
29
30  MatrixXd_delete(matrix1);
31  MatrixXd_delete(matrix2);
32}
33
34// this helper function takes a plain C array and prints it in one line
35void print_array(double *array, int n)
36{
37  struct C_Map_MatrixXd *m = Map_MatrixXd_new(array, 1, n);
38  Map_MatrixXd_print(m);
39  Map_MatrixXd_delete(m);
40}
41
42void demo_Map_MatrixXd()
43{
44  struct C_Map_MatrixXd *map;
45  double array[5];
46  int i;
47  printf("*** demo_Map_MatrixXd ***\n");
48
49  for(i = 0; i < 5; ++i) array[i] = i;
50  printf("Initially, the array is:\n");
51  print_array(array, 5);
52
53  map = Map_MatrixXd_new(array, 5, 1);
54  Map_MatrixXd_add(map, map, map);
55  Map_MatrixXd_delete(map);
56
57  printf("Now the array is:\n");
58  print_array(array, 5);
59}
60
61int main()
62{
63  demo_MatrixXd();
64  demo_Map_MatrixXd();
65}
66