mirror of
https://gitlab.com/libeigen/eigen.git
synced 2024-12-21 07:19:46 +08:00
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
// This file is part of Eigen, a lightweight C++ template library
|
|
// for linear algebra.
|
|
//
|
|
// Copyright (C) 2009 Benoit Jacob <jacob.benoit.1@gmail.com>
|
|
//
|
|
// Eigen 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 3 of the License, or (at your option) any later version.
|
|
//
|
|
// Alternatively, you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License as
|
|
// published by the Free Software Foundation; either version 2 of
|
|
// the License, or (at your option) any later version.
|
|
//
|
|
// Eigen 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 or the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public
|
|
// License and a copy of the GNU General Public License along with
|
|
// Eigen. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
#include "binary_library.h"
|
|
#include "stdio.h"
|
|
|
|
void demo_MatrixXd()
|
|
{
|
|
struct C_MatrixXd *matrix1, *matrix2, *result;
|
|
printf("*** demo_MatrixXd ***\n");
|
|
|
|
matrix1 = MatrixXd_new(3, 3);
|
|
MatrixXd_set_zero(matrix1);
|
|
MatrixXd_set_coeff(matrix1, 0, 1, 2.5);
|
|
MatrixXd_set_coeff(matrix1, 1, 0, 1.4);
|
|
printf("Here is matrix1:\n");
|
|
MatrixXd_print(matrix1);
|
|
|
|
matrix2 = MatrixXd_new(3, 3);
|
|
MatrixXd_multiply(matrix1, matrix1, matrix2);
|
|
printf("Here is matrix1*matrix1:\n");
|
|
MatrixXd_print(matrix2);
|
|
|
|
MatrixXd_delete(matrix1);
|
|
MatrixXd_delete(matrix2);
|
|
}
|
|
|
|
// this helper function takes a plain C array and prints it in one line
|
|
void print_array(double *array, int n)
|
|
{
|
|
struct C_Map_MatrixXd *m = Map_MatrixXd_new(array, 1, n);
|
|
Map_MatrixXd_print(m);
|
|
Map_MatrixXd_delete(m);
|
|
}
|
|
|
|
void demo_Map_MatrixXd()
|
|
{
|
|
struct C_Map_MatrixXd *map;
|
|
double array[5];
|
|
int i;
|
|
printf("*** demo_Map_MatrixXd ***\n");
|
|
|
|
for(i = 0; i < 5; ++i) array[i] = i;
|
|
printf("Initially, the array is:\n");
|
|
print_array(array, 5);
|
|
|
|
map = Map_MatrixXd_new(array, 5, 1);
|
|
Map_MatrixXd_add(map, map, map);
|
|
Map_MatrixXd_delete(map);
|
|
|
|
printf("Now the array is:\n");
|
|
print_array(array, 5);
|
|
}
|
|
|
|
int main()
|
|
{
|
|
demo_MatrixXd();
|
|
demo_Map_MatrixXd();
|
|
}
|