ITK  4.13.0
Insight Segmentation and Registration Toolkit
SphinxExamples/src/Core/Common/CovariantVectorNorm/Code.cxx
/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
int main(int, char*[])
{
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;
}