ITK  4.9.0
Insight Segmentation and Registration Toolkit
WikiExamples/Math/MatrixInverse.cxx
#include <itkMatrix.h>
#include <iostream>
int main(int, char *[])
{
typedef itk::Matrix<double, 2, 2> MatrixType;
MatrixType M;
M(0,0) = 1.0;
M(0,1) = 2.0;
M(1,0) = 3.0;
M(1,1) = 5.0;
std::cout << "M: " << M << std::endl;
MatrixType Minv( M.GetInverse() );
std::cout << "Inverse: " << Minv << std::endl;
return EXIT_SUCCESS;
}