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/*=========================================================================
Program: Visualization Toolkit
Module: TestArrayNorm.cxx
-------------------------------------------------------------------------
Copyright 2008 Sandia Corporation.
Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.
-------------------------------------------------------------------------
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
#include <vtkArrayData.h>
#include <vtkArrayPrint.h>
#include <vtkArrayNorm.h>
#include <vtkDenseArray.h>
#include <vtkDiagonalMatrixSource.h>
#include <vtkSmartPointer.h>
#include <vtkSparseArray.h>
#include <vtksys/ios/iostream>
#include <vtksys/stl/stdexcept>
#define test_expression(expression) \
{ \
if(!(expression)) \
throw std::runtime_error("Expression failed: " #expression); \
}
static bool close_enough(const double lhs, const double rhs)
{
return fabs(lhs - rhs) < 1.0e-12;
}
int TestArrayNorm(int vtkNotUsed(argc), char *vtkNotUsed(argv)[])
{
cout << setprecision(17);
try
{
vtkSmartPointer<vtkDiagonalMatrixSource> source = vtkSmartPointer<vtkDiagonalMatrixSource>::New();
source->SetExtents(3);
source->SetArrayType(vtkDiagonalMatrixSource::SPARSE);
source->SetDiagonal(1.0);
source->SetSuperDiagonal(0.5);
source->SetSubDiagonal(-0.5);
source->Update();
cout << "diagonal source:\n";
vtkPrintMatrixFormat(cout, vtkSparseArray<double>::SafeDownCast(
source->GetOutput()->GetArray(static_cast<vtkIdType>(0))));
vtkSmartPointer<vtkArrayNorm> vector_norm = vtkSmartPointer<vtkArrayNorm>::New();
vector_norm->AddInputConnection(source->GetOutputPort());
vector_norm->SetDimension(1); // Column-vectors
vector_norm->SetL(2);
vector_norm->Update();
vtkDenseArray<double>* const l2_norm = vtkDenseArray<double>::SafeDownCast(
vector_norm->GetOutput()->GetArray(static_cast<vtkIdType>(0)));
cout << "L2-norm:\n";
vtkPrintVectorFormat(cout, l2_norm);
test_expression(l2_norm);
test_expression(close_enough(l2_norm->GetValueN(0), 1.1180339887498949));
test_expression(close_enough(l2_norm->GetValueN(1), 1.2247448713915889));
test_expression(close_enough(l2_norm->GetValueN(2), 1.1180339887498949));
vector_norm->SetL(1);
vector_norm->Update();
vtkDenseArray<double>* const l1_norm = vtkDenseArray<double>::SafeDownCast(
vector_norm->GetOutput()->GetArray(static_cast<vtkIdType>(0)));
cout << "L1-norm:\n";
vtkPrintVectorFormat(cout, l1_norm);
test_expression(l1_norm);
test_expression(close_enough(l1_norm->GetValueN(0), 0.5));
test_expression(close_enough(l1_norm->GetValueN(1), 1.0));
test_expression(close_enough(l1_norm->GetValueN(2), 1.5));
vector_norm->SetInvert(true);
vector_norm->Update();
vtkDenseArray<double>* const inverse_l1_norm = vtkDenseArray<double>::SafeDownCast(
vector_norm->GetOutput()->GetArray(static_cast<vtkIdType>(0)));
cout << "Inverse L1-norm:\n";
vtkPrintVectorFormat(cout, inverse_l1_norm);
test_expression(inverse_l1_norm);
test_expression(close_enough(inverse_l1_norm->GetValueN(0), 2.0));
test_expression(close_enough(inverse_l1_norm->GetValueN(1), 1.0));
test_expression(close_enough(inverse_l1_norm->GetValueN(2), 0.666666666666666));
vector_norm->SetInvert(false);
vector_norm->SetWindow(vtkArrayRange(0, 2));
vector_norm->Update();
vtkDenseArray<double>* const window_l1_norm = vtkDenseArray<double>::SafeDownCast(
vector_norm->GetOutput()->GetArray(static_cast<vtkIdType>(0)));
cout << "Windowed L1-norm:\n";
vtkPrintVectorFormat(cout, window_l1_norm);
test_expression(window_l1_norm);
test_expression(close_enough(window_l1_norm->GetValueN(0), 0.5));
test_expression(close_enough(window_l1_norm->GetValueN(1), 1.5));
test_expression(close_enough(window_l1_norm->GetValueN(2), 0.5));
return 0;
}
catch(std::exception& e)
{
cerr << e.what() << endl;
return 1;
}
}
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