ITK  4.9.0
Insight Segmentation and Registration Toolkit
WikiExamples/Math/CovariantVectorNorm.cxx
int main(int, char*[])
{
typedef itk::CovariantVector<double, 3> VectorType;
VectorType v;
v[0] = 1.0;
v[1] = 2.0;
v[2] = 3.0;
std::cout << "v: " << v << std::endl;
// norm
VectorType::RealValueType vnorm = v.GetNorm();
std::cout << "vnorm: " << vnorm << std::endl;
VectorType::RealValueType vnorm2 = v.GetSquaredNorm();
std::cout << "vnorm2: " << vnorm2 << std::endl;
VectorType u = v;
// normalization
v.Normalize();
std::cout << "v: " << v << std::endl;
// another way to normalize
if( vnorm != 0. )
{
for( unsigned int i = 0; i < u.GetNumberOfComponents(); i++ )
{
u[i] /= vnorm;
}
}
std::cout << "u: " << u << std::endl;
if( ( u - v ).GetNorm() != 0. )
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}