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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 
demo_MatrixXd()13 void 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
print_array(double * array,int n)35 void 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 
demo_Map_MatrixXd()42 void 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 
main()61 int main()
62 {
63   demo_MatrixXd();
64   demo_Map_MatrixXd();
65 }
66